I am a mustang fan to the bone, no shame in being a fanboy here. That being said, my dad has a C7z and if the GS is even half as cool / fun to drive, i'd say its going to be one hell of a tough choice. Like i said, i love mustangs, and the GT350 is pretty much as good as it gets right now. The sweet thing about the vette is that targa top though, basically being able to swap from a "convertible" to a coupe in a minute or two is pretty damn sweet. I don't think you could go wrong with either, but even i cant decide which i'd really want.