It absolutely makes no financial sense to trade, and you have a great XK, but........
I think this is going to be one of things that bugs you until you make the move. I say if you can afford it, go for it. But it will be more than $10K because you'll have to put another $2-3K in upgrades. Just make sure whatever you get has every possible option on it.
Either that or buy a 2010 and keep the '06.........easy for me to say.
