But seriously a decent set of coils, the BC Relentless (I think they're called) come with adjustable top mounts and fully adjustable damping etc... For £600 odd and seem to be pretty good. Otherwise anything with KW or Bilstein will be good.
Then some decent 4 pot brakes as R32 isn't enough on track and they're very heavy
Upgraded Anti roll bars or the rear at least
Team dynamic 1,2's or other lightweight wheel wrapped on a good tyre
Will suprise a few people with a well set up MK5