Yoyoyo, I'm a ward clerk at a hospital, my whole families in health, im surrounded by nurses and nursing students every day so maybs I can help you out.
Ultimately there are massive shortages in nurisng and it really doesn't matter where you study it, you WILL get a job in a hospital somewhere. I work at a really nice friggin hospital and they come from everywhere, most of the Assistants in Nursing (AIN's) are nursing students and generally they either go to ACU or UTS.
Yes you can use nursing as a stepping stone to postgrad med, though it might not prepare you for GAMSAT as well as other degrees. On the flip side you might not get into postgrad med anyway and then have some lame science degree in chemistry with no health career prospects at all. But if you do nursing! a whole wide range of possibilities is at your disposal, you can do further training and become a surgical assistant or a specialist or whatever, even do grad diagnostic whatever bla bla bla.
Nursing as a career is very stable, it depends a lot on where you work. I work in a really ncie place and most days are relly fun and nurses are fun people to be around and most that I work with like what they do, there are heaps of different specialities and clinical nursing (which is where everyone starts) is shift work, which is actually good if you wanna study further. On the bad side pay starts pretty low but it does go up, its a decent wage and if you climb the ranks you can do pretty well, it can be very stressful particularly in some of the nastier public hospitals.
Yah thats my input, I think its a smarter idea than doing some vague shit if you know you wanna work in health then I think nursings a good place to start (its also piss easy to get in so you dont have to work too hard this year - YAY!)