Stop it guys (no, don't really) - too many good ideas!
Have you thought about the Mercedes GT Convertible. Rare, awesome soundtrack, very handsome, large boot and a continent cruiser. I keep toying with the idea.
Also the Mercedes SL for less money. My wife has one....
Yes, the AMG GT is on my list, and the early non-S coupes (which I prefer) are dropping in value very nicely. The problem, if there is one, with the SL is that when I see a guy driving one I always wonder whether it is his wife's or his boyfriend's car.
The most appealing idea so far:
But I think I have missed the boat on pricing