Here's my other point of consideration between the two.
First, there's absolutely nothing about the GT I'd have to buy "despite". (For example, "despite" the fact that it doesn't have...." etc.) The only "despite" for the GT is that's it NOT a GT500, but that's not a flaw - it just is what is.
Second, there ARE some things I wish Ford would have done differently for the 2011 GT500 that I think it MAY do for 2012. For example, why the hell would they make HID lamps standard on GT500, but leave the fog lamps cheap halogens? Then there are the dumb choices like no heated seats and a manual passenger seat. Sure, both of these can be fixed in the aftermarket, but for those of use who'd ALSO like to be as faithful to "stock" as possible, it's annoying - despite the car's tremendous speed and handling.
And then there's the issue of transmission. With CAFE standards coming down so hard (and harder each year through 2016) - Ford is looking for EVERY opportunity to improve economy. In addition to competitive reasons with other vehicles, I have a suspicion (or fear) Ford may be adding a proper dual-clutch automatic transmission. Sure, it's not "muscle car-ish", but it's the way of the today's supercar and allows for higher EPA statistics due to being able to program it any way Ford wants (and allow as many programmable settings for the driver as Ford wants).
In short, I'm afraid 2011 Shelby may be a work in progress until 2014's 50th Anniversary year. And in that case, I'd rather own the 2011 GT in the years leading-up.
Could I be wrong? You bet. Am I likely wrong about one or more aspects? Yep. Am I likely wrong about ALL my guesses, no. And it's because such uncertainty exists that the choice continues to be a tough one.
On the upside, there are NO bad choices. This really is a choice between say - Racquel Welch and Demi Moore (in their primes).