I was thinking similar thoughts myself, but i ended up ordering a new 313ps non-gt, mostly for piece of mind, and i wasn't bothered about the gt pack contents and price!
I want to fit my own sound system, and so 2.5K for leather seats was a bit much.
It all comes down to how much a correctly run in car is worth to you. i'm not looking at resale value at all, its all about owner number one!