Keep in mind you'll need to run premium gas on a GTP, which is not true with the GT...extra costs some don't think about. Not a huge deal, but if you're REALLY on a tight budget, that's something to keep in mind.

With these cars, maintenance is the key. A properly maintained 3800 series engine will run darn near forever. Just make sure the body will last as long as the engine by checking for rust where dsmuts mentioned.