What should my next mod be?

[CtrlAltDefeat]

As it sits, when I get my taxes back, I should have a few hundred to spend on mods, and I am trying to figure out what to get. I have not really done much cosmetically to her, as I would rather have a plain car that performs well, then a pretender that looks great, but has no performance (all show, no go). I have reached a point, I think, where the bang for the buck quotient has leveled off, and cosmetic mods might be something I seriously look into.

So far I have:

Performance:
Tanabe DF210 lowering springs
NST under-drive crank pulley
NST engine bay short shift kit
Ultra Racing 19mm rear anti-sway bar

Cosmetic:
Debadged
35% tint sides and back
Decepticon decal
Cheap faux carbon fiber shift knob
Cheap chrome exhaust tip (wal-mart special)
Stubby antenna

I'm not sure where to go next on this. I really want to get new wheels/tires, but I refuse to get any thing heavier then stock, and really would prefer to get something lighter. As such, wheels/tires would be around $1600 - $2000 for the wheels I want(Enkei RPF1s with Yokohama S.Drive or Parada Spec-2 tires).

Basically I cannot afford wheels/tires or coil-overs at this time, and I don't know if exhaust/CAI mods are worth the money, especially if I go custom in the future with FI. I also would not mind a new stereo system, but that might be too expensive too. I'm going to start a poll to see what you guys think I should get...