Id think you, of all people would realize the benefit of lightness!All in, I think I'd prefer a C6 Z06 - not all that much more, esp if you buy a 2006 model, which by definition is newer than the Miata conversion by at least one model year. And you'll likely get a mfg warranty and thinks like 505 hp, 32 secion rear tires, stuff that can never be had in the miata conversion.
The miata weighs 1000lbs LESS than a Z06 Vette
Thats HALF an elise, LESS
Stopping distance, corner entry speed, traction in during transitions are all GREATLY higher in a lighter car.
Oh, and the Ecotec setups ARE NOT better balanced in a miata than an LSx setup.
The main reason (Besides the heavier part of the LS motor sitting LOWER and further BACK than the stock motor/ecotec) is the t56 transaxle.
the LSx swaps, when done properly, weigh about the same as stock, but have a considerably lower CG.