I bet it's different in Europe then in the US. As someone said before, I saw one stingray and I was hooked, knowing I would have one.
I sold my fully loaded BMW Z3 coupe which I only drove on sunny days, just to restore my 74 and get it up to a certain modern standard (like overdrive transmission, electrical fans, new engine, new stereo, aftermarket seats, power door locks, xenon headlights,...)
The Z3 is relatively fast, very comfortable, pretty rare and has lots of goodies, but it just cant beat opening the throttle on the highway in a Chevy V8 Vette. I for sure would not sell it, I did the opposite as you are thinking off. (oh and I live in a country where gas costs 5$/gallon)
Nick