You are absolutely correct that there are screaming bargains on 2013 Corvettes. At the same time, and I must admit that I am biased, there are literally hundreds of engineering improvements in the C7. I'm sure you have seen the approximate 20 great reviews by car magazines regarding the StingRay; more than a few of these magazines had some pretty severe criticisms of the C6 including it seats, which I mention because you're talking about tracking your Corvette, and those same magazines are now universal in talking about the C7's seat and its many, many other improvements. Yes, you can get aftermarket Sparco's or other seats and put them in a C6 and still be thousands and thousands of dollars ahead. Most importantly you're going to have to make your own decision based on, of course, financial considerations. The bargains on the C6 are going to become even better as the C7 start to appear on dealer showrooms in the next month or two, so I believe you have plenty of time to learn more about the C7 and decide for yourself which of the two options is better for you.