I didn't quite study radiography, I studied Nuclear Medicine (Have very similar subjects, as both are Ba. MRSC) at Newcastle, so I've got 2 cents from their course.
Radiography as a whole is really interesting if you really enjoyed biology and the greater sciences at high school. You have a pretty good degree of patient contact and depending on your department have more or less autonomy.
As for job prospects, domestically it can be hit or miss but at least Newcastles program was recognised in the UK, Europe and the US. Often, when people graduated they would go do a few years in the UK on flexible contracts and travel.
The only thing I will say with radiography is that it's very much a point and shoot modality and even CT is a similar way. You greet the patient, explain the procedure, setup, do the imaging and then the patient goes away. For most people, that is awesome, but for others it can be difficult as they want to know more. That's something you will learn with clinical experience (I just transferred to Med after finishing my second year for that reason).
Best of luck, and USYD graduates are great. I worked with a few at St Vinnie's last year, so can say your program will be top notch.