dont buy books before you start - try out lots of different ones and find the one in each area that you like. And dont necessarily just look at the ones on the booklist - often the booklist is a bit biased (ie members of the teaching staff wrote the book, is pals with the guy who wrote the book, its the book they used back in 1968 etc etc)
Some ones to check out that may not be on the list:
TORTORA + DERRICKSON: Principles of Anatomy and Physiology (11th ed)
A really good book which covers most of the anatomy and physiology you will ever need to know in one book. Also has bits of microbiology, biochem etc thrown in. Also known as "The Big Red Bible"
POCOCK + RICHARDS: Human Physiology the Basis of Medicine. (3rd ed)
This is an AMAZING physiology book - cant tell you how good it is lol
ABRAHAMS: Clinically orientated Anatomy
Really good - well explained with good diagrams and stuff
Oh and I'm on a PBL course and could easily get away with having no books - we have our own private medical library open 24/7 365 days of the year: so dont think PBL means no books supplied by the uni