Regarding re-sale value, I respectfully disagree with the folks commenting here. Check out the price of a 5 to 7 year old Porsche Boxster. The Corvette (similarly priced when new) retains much more of its value. The info is just a click away.
Side note: I purchased my first domestic car (a Mustang GT) about a year ago. So far, I'm pleasantly surprised. While it definitely has its flaws, it's also infinitely more reliable than my RX8, less costly to maintain than my Boxster, and more entertaining than my Z3. I'm not tying to import bash... just dispelling some myths about the "home team".
I agree with the second poster. American cars have closed the gap that existed 15 to 20 years ago. Porsches lose tons of value in just a few years because of a major engine design flaw that afflicts all Boxsters and most 911's, except for the Turbo and GT3. BMW also had major engine flaws in their M3's and M Roadsters in the 2001-2003 models. Audi? Crap.
You don't hear much about catastrophic engine failures in Corvettes or Mustangs or some of the other American performance cars.
I've had both import and domestic and currently have older Porsches. But, when its time to replace them, I am probably going with a Corvette. Granted, their interiors are a little on the cheap side, and that's a big one. But, performance and reliability wise, they are at or above Euro levels. As for Japanese, they really don't have any cool performance cars, save the new GTR from Nissan. I don't' much care for the 350Z...
Cars made for the American market are generally of better quality than those made for other markets. It is well known that Audi has frequent malfunctions. The same applies to other EU car manufacturers, only to a lesser degree. It is not surprising considering how often the market launches new models. Quality control is no longer the same as it was in the golden times of sports car production (remember the Mercedes Gulwing from 1950-ties).