I don't think you're crazy at all. I've often thought of adding a Z06 to the stable. Nothing like the feel of a high horsepower Vette. I've had several Corvettes since the mid 70's and will always have a soft spot for them. I'm holding out for a C6 Z06. 500hp and the best looking Vette by far.
I would buy a Z06 in a minute...no need to rationalize your decision...different car than a Porsche but very respectable. Drove one last week and was seriously impressed...loved it. "DO WAHCHA LIKE"...
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2000 Boxster S
Black/Black/Black
Normally, a lightly used Zo6 is a real bargain, when you consider price to performance. Pretty good value and of course, one ALWAYS gets a PPI before purchase.