I would recommend doing the HID upgrade for the headlights. I did it on my 06 Sport and absolutely love it. They're easy to install and are a good buy. Other than that, some good all season floor mats would be another good addition (Weathertech, Husky, Nifty Catch All, etc), or maybe a DVD Navigation system. I also upgraded the exhaust on mine (Borla) but I have a V8. You might want to keep the exhaust stock on yours. Whatever your preferences are, go for it and have fun!