you are young you need that brain for a long time! Shoei is by far my favorite look for last years model to save some money, also black or white is much cheaper than those cool paint jobs.
Thats a good point, I mean the part about hte black and white. Who gives a damn what the other riders at the track think of you? When you're good enough to blow past them on a bike half the displacement, you get to laugh.
If money isn't a worry, get top notch gear now. Otherwise, buy medium grade gear now. Stay away from the cheap stuff. Well Helmets can be an exception. But in terms of your armor, jersey, pants etc. Go medium grade stuff. I also recommend a helmet in the 200-300 price range. It'll keep you safe. well safer. Alot of freestylers use Shoie, that should tell you something