I've noticed quite a few GTs in each of the Ford dealerships (the $150k GT). There was a retro schemed GT and a red one at a local dealership.
FWIW, I rather like the 2 tone colors, but not that charcoal/camel combo. I prefer the light graphite interior with the black seats and black carpet, but I was not about to pay $300 for a color combo change that costs $0 at the factory.
I saw the GT/CS package in person and while it wasn't too shabby, i wasn't going to pay that much money for some body cladding. While the rear diffuser is the same as the GT500, I wasn't impressed by the other parts enough to go with the GT/CS.