I used Mastercraft in Ovilla. Couldn't be happier with the paint and body work they did. He guarantees the work for as long as he is in business. It's a family business that has been around for many, many years. They do lots of custom work and have done many Cobras. They aren't cheap, but their work is high quality. If you go there as for Erik and have him show you around the shop. I'm sure he will have some already painted vehicles at the location so you can see some of their work before you commit.
http://mcautocreations.com/