For under $2000 you can get the following:
SRI or CAI - $85-260
Hondata4 - $500
Headers - ~$200?
Sway bars - ~$200-300?
Strut bars - ~$100-450
Better tires - ~ $400
Lowering springs/struts - up to $1-2k range
Limited slip differential - up to $1k
New clutch/flywheel - ~$1k
Big break kit - $1-2k (need bigger wheels for this so price will ultimately be over $2k)
There's a lot you can do under $2k. You do need to decide which way you're going because if you turbo the SRI/CAI, headers, and Hondata4 flash will be useless like crazy said.
Crazy and others, correct my ranges if they seem wrong or just way off!
