My personal favorite is the 90-93 TT spoiler. I bought a Ionic Dynamics replica one and installed it. Looks great! My friend has a 2+2 with a TT wing on his as well. Looks killer. Thats what I'd get, that or a 94-96 spoiler. Those look pretty good. Dont throw some huge ricer wing on there, keep her looking stock-sexy!
There are some other really cool aftermarket wings that replace the third brake light, some neat roof spoilers, etc that look good as well. Google up some images and see what you like best!