Nice list. Wasn't looking for a 4 door. Really want a "sports car", so the M5 is out. Definitely nothing American, corvettes are a dime a dozen. In my parking garage there are 3 Z06s and 2 ZR1s, forget about what I see on the road. Vipers are rare, but Snakey drives one, so no. The Ford GT would be the exception, but way out of range of the "$94k" GTR budget.
Then there is the R8. I just don't know what to make of it. It's not an ugly car, but the visual balance seems... off. It is mid engine, awd. Big plus. But why wouldn't I start looking at Lambo's instead?
The others you list might be viable options. I have to admit, none of them came to mind. I would have to look at pricing. The GT3, are you referring to the 911 variant? If so, what year?