I have to say Porsche. I have a boxster and I wouldnt trade it for the world. I thought about buying a vette and im thankful I didnt. Everywhere you look there is an old guy driving a vette. They have become everday cars. But a Porsche, even the cheap mans porsche gains more respect from the average individual. Ill never forget it, I had valet at universal studios and when I went to get the car, it was parked up front, the vettes were in the back, as they brought my car to me the attendent (a clown) did a dance around the car then pretended to touch it and did the whole I burnt myself thing. Prior to that, a corvette was brought to a person, and not even a glance.
The porsche doesnt have the raw power the vette does but it will make a more drastic statment and give you the feel of driving a go cart (handling) on the streets. My only other choice would have been the lotus elise, only because im a cornering freak and not that much on the raw power gig.
The cayman will give you a driving experiance unlike anyother for the dollar. Mid engine with hard top, 245hp just for the base not the S and 0-60 in 5.8 seconds. Im jealous.
So bottom line is, old guys drive vettes, LOL, just look around and you'll see what im talking about. Porsche will elevate you to a new level of driving experiance and customer service. Not only at the dealer but also at valet.