Like others have stated; all the performance upgrades covered by factory warranties = no brainer. Unless you want slightly better gas mileage (which shouldn't be a major concern if purchasing a V8) then stay away from the 3.73.
The splitter is slightly different/larger on the GT PP.
The USB connection for the phones is mainly for power. The system will try to read your phone like a USB device and fail. Like S550guy said, you're best bet is to plug in and continue streaming via bluetooth.
With GT PP being part of the deciding factor, I'd probably go CO - the contrast with orange body and black wheels is stunning, or Magnetic - love how dark it is yet how the metallic flakes really shine in direct light. Third choice would be Ingot Silver - also love the contrast, and I love how...
Both are fine. I don't care for the chrome tail light and grill treatment on the 50th AP myself. In the case of a GT, for me it'd be the 20"s or the premium dark 19"s. Also, in some cases I think it depends on the color you picked for the car.
I found a black 401A at Davies Ford Inc. of Charleroi, PA. I didn't call them or anything, but sticker on their's is $44,295. Looks like it's got everything you want.