Chat it up via PM or email with Putz. He just got rid of his GTP for an Explorer. He will probably have a lot of tips and advice if you're considering one.
Just a note though...you will probably need some premium gas for a supercharged GTP. So, you'll end up paying more for that luxury.
Aside from that, GP's are nice. They are quite a bit bigger than a Contour, but I've found them great on the highway for cruising.