What should I upgrade on my '01 Prix GT 1st?

Just got my '01 Grand Prix GT and I love it! Going to tint the windows soon but was wondering what you folks think I should do as far as upgrading performance. Thinking of uping the exhaust sytem or something.... not really sure. What do you folks recommend for the most bang for my buck on performance upgrades on an '01 GT that is stock (well as stock as GT's go i guess).

Thanks for your help!

Inexpensive: under 100
Cold Air Induction
Thermostat
Remove the Ubend (search if you dont know what it is)

Expensive: under 1000
Rockers
Headers
Electric water Pump

More Expensive: 1000+
CSC
L67 swap

tinting the windows will look sweet! mine are 20% all around and look sweet. hmmmm. for a first mod it would be nice to get a cat back exhaust. then maybe i'd work my way into a thrasher cold air intake. then maybe (if you can find someone who will install this part b/c i had trouble finding someone :screwy: ) the u-bend replacement. you can check out my car with a bunch of little and big mods on it at www.cardomain.com/id/fallen_blade (http://www.cardomain.com/id/fallen_blade) hope this helps {SoW}Rob