I'll tell you what. We had a 99 C-5 Vette and an 00 Mustang 4.6GT in the garage at the same time. Both stick shift convertibles. At the time, I thought the Vette had it all over the Stang (although my wife still has her Mustang, and my Vette is gone)
However, in looking at the C-6 (which I love), and the 05 Mustang in this month's Motor Trend, I'm changing my mind a bit. The styling on the Mustang is gorgeous. And the promised SVT Cobra will have an independent rear suspension, and the same power as the stock Vette, at the same price as the stock Vette.
I think it is going to be a much closer comparison than it has been in the past, and that no matter which way any of us chooses to go, we're going to end up with fast, incredibly good looking, comfortable cars!!