Get the GT. If you get the V6, chances are you'll second guess it in the future and say "I wish I got the V8"
Either way, good luck!
i have a V6 and sometimes i do think about the V8, but it wouldn't make much sense to trade it now(unless for a Saleen ) cause mine is slightly modded. plus in a couple of years, the next Mustang will be out with a bigger V8 than the one that's out now. i'd just rather wait and see what that will be like.