Thanks for the replies. 
A quick question: Should I just buy all three of the textbooks?
I get paranoid thinking that some textbooks are 'withholding' bits of information. Haha.
Not worth it.
Buy what your school uses at least.
Just get copies of the ebooks for the others (local library, school library, friends from other schools, might be uploaded here on AN).
If you want to spare the money - get your hands on a copy of Nelson (which by now it should be obvious I'm a big fan of this textbook). I try to save money though - I wouldn't reall really want to blow like $200 just on VCE Physics. I wouldn't bother buying all the textbooks.
In the end, you'll be using the textbooks to get a understanding and then refine it through trial exams. Jacaranda is pretty poor with it's information, but Heinemann is decent for the most part, Nelson is better yet. Just use wikipedia/internet/AN/study design for more depth.