[Dangerous Doug]

What? Nobody going to take a shot at the "pecking order"?

Try this list:

1 Original Shelby Cobra (from the sixties...) $$$$$
2 "Real"* Shelby Cobra---aluminum body $$$$
3 Kirkham $$$ (only because it has the aluminum body, and replicates the originals, down to the frame. Kirkham supplies for Shelby)
4 ERA $$
5 Superformance $$ (okay, 4 and 5 are debatable. ERA has a more "correct" body. Though the SPF IS a great-looking car. Besides, I own an ERA...)
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.
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From there, it gets blurry. Backdraft, Factory Five, others. It gets tough to call. A lot of the value in the cars is how they are built.

Do your homework, and find the Cobra that fits best for you. I chose ERA because I wanted a very exact replication of the original body shape in fiberglass. Truth be told, I'd prefer an aluminum body, but the project was expensive enough as it was.

So, it kind of depends on how much money you want to spend.

* "Real" meaning a "genuine Shelby Product, newly manufactured replica of the original Shelby product"
-- Fair enough?