Wow! A girl that knows how to drive stick...
Congrats on the purchase! Forgot to mention, blue is the fastest!
It really depends on what your biggest gripe is. IMO, the SVT lacks power. If you aren't planning on adding much for power, I recommend a new tune... otherwise get the power adders first, then tune.
I hated the stock stereo, and I belive the 2nd weekend I owned the car I swapped my stereo stuff from my F-150 in, still have the same box with the notches for seat brackets and humps in the floor.
I'm slowly working on the power, but I'm waiting on seeing what my tax return will be. I really want to finish off my stereo, so I think I'll be getting 2 12's and some components with that money, and selling what I don't want anymore. With whatever is left over (and depending on what I feel like spending from savings) I want to get a short throw shifter and rear engine mount. Then, depending on how much OT I put in this spring/summer, a tune. Winter MIGHT force me to buying some different winter tires and rims, but I don't want to think that far ahead!