Backdraft,
I think your post says it all. Your second thoughts are worth listening to. A Cobra purchase is certainly one of the top irrational purchases a man can make. If there is doubt, if comforts and inconvenience come into play in the slightest; if having your car break down and need repair, if having no no spare tire or the good likelyhood the car will leave you stranded, are concerns, then the Corvette is the better choice.
Any person who is nuts enough to buy a Cobra should have no doubts; should be salivating; should be giddy with anticipation. Because all the downside of owning a Cobra will be a disappointment if you don't have the fever that causes one to buy one of these ridiculous cars.
A reference:
http://clubcobra.com/forums/showthread.php?t=82015