Here's what I thought was good, I'll list a main book then put a supplementary text in as well, the bold texts are my personal recommendations - As with all textbooks, buy the latest edition:
Anatomy
Primary Texts
Gray's Anatomy for Students/Netter's Anatomy Atlas - If you buy Gray's don't buy Netter's and vice-versa since they're the same.
Supplementary
Rohen's Color Atlas of Anatomy - Rohen's uses photos of cadavers which makes it great for revision
Netter's Anatomy Flashcard - Probably the best for exam revision, handy and to the point. This is why I recommend Gray's, if you buy this too then you have both.
Physiology
Primary Text
Guyton and Hall's Medical Physiology - Probably the most popular and widely used for good reason. It's written in a fairly readable manner and goes into about the right amount of depth. You'll need to use Boron's to add to this for certain topics.
Marieb Anatomy and Physiology - Very much a beginner text, very very easy to read but little in the way of detail. Health Science I think (some Unis) recommend this but it's not enough for medicine. It's good if you use it as a stepping block to Boron. 8th edition is pretty good.
Supplementary
Boron's Medical Physiology - Some might say that this is a Primary Text but I find it's far too long winded, too detailed and too boring to use. Use this for more indepth stuff and the pictures are probably the best.
Siegel's Essential Neuroscience - The only specific textbook I bought for any topic in pre-clin. This one's really easy to read (for a Neuro book) and breaks everything down in an easy to understand way. It's not wordy so it summarises a lot of info very quickly which I like. The diagrams are fantastic for understanding complex pathways. Highly recommended though don't buy this until you need to do neuro, borrow it to try it out first.
Pathology
Robbin's Pathological Basis of Disease - Very easy to read, pretty much my goto book for Path. Most lecturers from UWS use this and it's everything you need.
Pharmacology
Rang and Dale's Pharmacology - Goes into the right depth and good amount of info. Easy read and is very accessible for the pre-clin student.
Clinical Medicine
Primary Text
Talley and O'Connor's Clinical Examination - You WILL buy this book at some point and every doctor will refer to this text when teaching you clinical exams. Buy it and don't look back. Comes with a demonstration DVD which is great for revision.
Toronto Notes: Toronto Notes is a complete, yearly revised set of dot point summaries for nearly every medical subspeciality written in a level of detail that is perfect for medical students. This book is focused on clinical medicine only and devotes little time on physiology and anatomy but as a primary text, with lectures as a supplement, I cannot recommend any book higher and this was my most used textbook in all my clinical years. The paediatrics and psychiatry sections are completely adequate as a standalone. I recommend the 2013 edition if you need to read up on DSM IV TR and onwards for DSM V.
Common Clinical Cases - A Guide to Internship by Sanjaya Senanayake: A superb clinical case book written in an easy-to-read and often humourous manner dealing with situations commonly encountered by a JMO. This book walks you through a case, quizzes you on questions you should be asking and highlights the important things you need to consider in the encounter and what you should do. Highly recommended.
Supplementary
Kumar and Clark's Clinical Medicine - It's a summary text of physiology and anatomy and path with a clinical focus, not bad reading for pre-clin though I personally didn't use it as much as the others. You don't have to buy this one but some students found it helpful, other's less so. I'd imagine this would come in handy for clinical years.
ECG Made Easy - Reading ECGs 101. Short and easy to read, though the ability to read and ECG isn't stressed in pre-clin. Definitely get it for clinical years though.
Equipment
While I'm here I may as well throw in an equipment list as well. I recommend buying everything listed below unless stated otherwise.
Stethoscope
You may not use one of these till fairly late in pre-clin (second sem of firstie in UWS) but it's good to have one with you in case something cool comes up on the wards. They're durable, easy to carry and don't need to be replaced for years. For this reason, don't be a cheapass, get something decent to begin with or else you'll regret it like many in my year. I don't recommend pocketing these or just shoving them in the bottom of a bag, I had a key go straight through the diaphragm of a brand new Classic II All Black; some people may laugh at you but just wear it around your neck. It really is the best way of carrying one. As for colour, just choose the one you like the most, no one cares really if you have a bright pink steth.
Littmann Classic II SE - Probably the most common steth you'll see students carry (I've got one myself). It's relatively cheap, $80-$100 AUD, good and solid build quality and no complaints about it's sensitivity. The only thing I don't like about this is the join between the tubing and the head of the steth, the part that you twist to select between the bell and diaphragm, it doesn't feel like it would break, far from it and definitely good quality compared to other steths but it feels weedy to me and I'm not sure the way it clicks into each position is as solid as I would like. Wearing this steth, it's difficult to clip the earpieces into the bell sort of a like a lanyard but this is a very minor complaint. Highly recommended buy.
Littmann Cardiology III - The "Cardio" that all the students like to rave on about. It's definitely more sensitive than the Classic, noticeably so in fact. Build quality and solidity are a notch higher as well and ergonomically, I feel it's definitely better. It "clips" in around your neck better and the head just feels more solid. Comfort-wise using it, it's identical to the Classic. Caution that this costs $200AUD+ and most students would not "need" something like this. It's a good buy sure, but the price makes it difficult to justify as a student, get one when you're a doctor.
Tendon Hammer
In general, there are 2 types, the queen's square and the tomahawk. (Google image if you're confused). I use the former because I've never come across the latter but I'm sure they perform the same. These are cheap, easy to procure and are necessary to perform a proper neuro exam. Generally, there are stainless steel folding models and plastic flexy ones, the latter some people find easier to use but I prefer the folding models as you can easily just pocket these.
Sphymomanometer
Aka, the blood pressure cuff. Cheap, you can get these for about $20AUD or less. Just buy one to practice with.
Tuning Forks
Very expensive but necessary for neuro exams. In my experience, they're rarely used in practice and the School of Medicine should provide them when you need them. I was given a pair of these as a gift but I can't recommend their purchase.
Penlight
Basically an overpriced flashlight, you'll need one so buy one but expect them to break. They tend to be made cheaply. You might be able to get away with using a small, low powered flashlight instead.
Endnote
I own all the books on this list (and a few more) but I realise that not everyone can afford a library of reference books so if you're looking to purchase the bare minimum then accessing the rest off the University library or whatever then I recommend the following:
Gray's For Students or Netter's
Guyton's Phys
Robbin's Path
Rang and Dale
Talley and O'Connor
Littmann Classic II SE (don't get the Black Edition, costs extra and is usually special order)