Is that price for a base car or premium? Either way, that is a great deal as I paid $28,400 for my base model car with auto tranny last August and I got it for $173 over invoice. From what I understand, you cannot order a new 14 any more so I'm assuming that the dealers won't be getting many more cars in as well. Around here, most dealers only have a few GT's or none at all. If you wait, you may not have many to select from.
I personally don't like the look of the 15 so it wouldn't even be a question for me. I also don't buy first model years as I want other people to deal with any teething problems that come up.
2014 GT, Sterling Gray, base model, Automatic
GT500 AB, GT500 OTA pipes
Bob's oil catch can
Ford aluminum finned diff. cover
Ford all weather floor mats
Ford trunk liner and cargo net
Ford locking gas filler plug and wheel locks