The Cobra has a distinct and unique look that is instantly recognizable. Everyone knows what it is. Then couple that with the engine - straight pipes with no exhaust - and the combination of look and sound just gives you a queazy feeling in your tummy. If I could I'd pour chocolate on it and eat it
For some reason the Daytona Coupe (while rarer and equally visceral) will not get the recognition of the Cobra. People will really ask what a Coupe is because they really don't know. Everyone knows the Cobra roadster.
Frankly, it is those attributes that make the GT40 and Ford GT appealing to me. (And the FGT because it has air and 3 point seat belts [on her side]).