superformance is the beez kneez when it comes to cobra replica's, but I'm not sure it's available as a kit.
The superformance is nice, but you don't really build it. They also claim they are real shelby CSXs because they paid him a crapload of money to do so, that kinda irks me. The factory 5 seems to be of great quality and you can make it your own, not to mention it is cheaper if you do the work yourself. A lot of pride in craftsmanship of the owners and well deserved too.