I like the idea with a bra. Another simple yet noticable thing would be to get those hyper white headlights. Maybe put on a set of fog lights if the car doesn't already have em. First thing i did with mine was to remove the stupid dent guards on the doors. You could also get a smaller aftermarket radio antenna, i know the factory ones are hideous.
These are just somethings that I would do that are simple cheap and won't make the car look too ricey. But its put to you. I always perfered a nice clean looking car.