well, it depends on if you are going for looks or performance. You could put some 19s on your car, there are a few out there, some are on this board. If you have 19s though, they will weigh your car down. As for performance mods, if you are looking for bolt ons, start with Intake
then exhaust. Go with cat back or get a custom exhaust. Then get headers. Or, save up your money and get a turbo.
I went Injen CAI
, then Tanabe SRM exhaust, then I am getting headers (waiting to see what trial does with the GT, the GTS gains were awesome), and then I will get a high flow cat with custom piping down to the muffler. As for looks I just have wheels, waiting for the drop and then possibly a body kit. There are tons of kits available, just look around you'll pick up some things as you go.
Good luck man, PeaceOut and welcome to the board.