A cheap-ish mod would be tint
Depends on what you tint and how dark the tint is. Also, the quality of film and who applies it. So it could be cheap, but what robare99 means is its cheap-er than most other mods.
I would suggest Clear Corners
. Around $30-40. Already did teh antenna S2k thing. Euro-tails if you're into that.
Get new headlights. The MTECH krypton halogens are pretty cheap and they sell them at the ECelica store. Have fun!