Since you liked the looks of the GT, did you ever think about modding it with a blower? If you're already upside down in trade, why blow up your perfectly healthy (though I agree UNDERPOWERED) motor? This will only result in a car that may have value for parts. If you supercharged for 4K, be it KB or Vortech, or who ever you choose, you could keep the car you like and enjoy it, instead of going 10K upside down with your trade, for something that the blown stang will very possibly beat. It just doesn't make sense to me on the dollar side of trading. Good luck with your project though!