If you want a Cobra, there are a ton of replica kit makers, Shelby himself is still making continuation Cobras. Then there is Kirkham Motor-sports of Utah. It is my opinion that if you want the best Cobra for a fun authentic drivable car then you have no option but getting a Kirkham.
If you dig far enough you will find that Kirkham is the aluminum, body supplier for Shelby.

You can get a Kirkham that is as close to an original Cobra as possible, or you can have some safety and performance updates.