For the 'Vette, looking at a C5? Not trying to be pedantic, but that is technically mid-engined.
On the track, even base 986s can overcome C5s when the course is fairly curvy and tight.
Really would have to drive both back to back to get a feel for which one you prefer. And also, get a pre-purchase inspection from a reputable shop - that right there can help you avoid any potential pitfalls on deferred maintenance or pending trouble points (such as the water pump).