Probably want to start with the mounts. The factory ones are possibly made from cheese ;-) Most people need to replace at least the rear diff mount and the rear motor mount. I've also had to replace the transmission mount and the front diff. mount. Then a COBB AP tuner would be next on my list. If you live someplace that is hot a lot of the time methanol injection is great upgrade. Or even if you don't it will increase performance and keep knock at bay. Then you've got intake, downpipe, suspension mods....
