GTP looks like the best deal at the moment (depending on price).
Check the rockers for rust under the plastic parts.
ABS could also be the controller. My brother'* light has been on since we bought it (98 GT with 68k. Now has 78k)
Also, 4 doors I think have rear window regulator issues as well.
As got price, seeing as I only paid $400 for my brother'* GT and $600 for the 97 2 dr GTP I had, I think I am slighted. I would sat that $3500 would be a good deal with lower miles (around 100k)
Let me know if you want me to come look at it with you. I have an LS1m which I can scan the car also, but it'* in binghamton. I am passing through sometime saturday, again sunday evening. and then again on tuesday... (I love moving)
2007 Saturn Aura XR | 1970 Chevy Blazer 4x4 | 1970 GMC 3/4 Suburban 4x4