Need some unbiased advice on a dilemma, sell or not to sell, that is the question

I love the GTR too! Would love to have both some day. The 2013 Shelby is going to be insane, I have a friend that is very popular in the Mustang world and actually worked with Ford engineers on the development of certain parts for the Shelby. He is trading in his KR with 600 miles for the new 13 because he says it is that good. Can't wait to see the numbers on the 13!