i think someone else already brought this up. but, i would get all the mods you plan on using first, THEN go for the chip. reason being, to get the most from your chip, you should have it custom burned to your car. when its burned you should already have your mods done. if you add mods after the chip, you may not be getting optimum performance.
as for mods, definatly, the first thing to look into would be an intake and exhaust. *cough* i hear yodude performance makes a great exhaust.

but ofcourse the decision on exhausts is up to you.

after those two, its open season usually. plugs, wires, shifter, throttle bodies, etc, etc....then chip
hope this helps
josh
www.yodudeperformance.com