She's all stock right down to the c/c. Should I leave her stock or turn up the heat?
Guys will attack you from both sides about that issue. When I first got my GN (Stock) everyone was telling me to leave it alone because it was in great shape and had some of the slightly rare options like manual windows and seats. For a while I had enough enjoyment just driving it as-is, but I knew eventually I'd want to upgrade it. I have a bunch of bolt-ons now but haven't done anything major/internal.
It's really up to you and what you feel is right. If you're interested in just being a collector then leave it stock and enjoy it. If it kills you to have a car sitting in the garage not reaching it's full potential, then dive into the money pit and start modding. Don't let anyone else tell you what to do with it.
Car looks great with the new paint, makes me want to put my stock rims back on for a few weeks.
Sounds like a steal at that price/mileage. Lucky!
If you do change anything, stick some wider tires in back, you can still use the stock rims. I just always thought these cars had a very weak stance from the factory for being such a mean car. Skinny little rear tires kill the attitude.
You can do a few things without really "modding" it...
-ScanMaster. Lets you see how the cars running, monitor codes from the computer, view other engine data, etc.
-TurboTweak Chip. Everyone rants and raves about how the car feels entirely different with a new chip in it. The factory chip has too much timing for todays lame-o gasoline and there's a good chance you'll have detonation even at stock boost levels.