That 2.8l v6 has potential. According to the Saab forums there is a tune for $850 that gets them to ~320chp, 280-ish(?)whp and lots of torque. They can be found with higher mileage for under 14k, I think.
So the bang for the buck factor is pretty good on those also. Maybe even better than a gtp comp-g, I don't know.