The LT4-powered Grand Sport models of 1996 are among the few collectible C4s, and right now they're relative bargains. This low-mileage, six-speed roadster, sold with the matching removable hardtop, went for $43,000, which even seems a bit high to us. The car came with tons of documentation, including the window sticker, which enhances desirability. Don't throw away even the smallest scrap of paper associated with your Corvette. The next owner will want it.