Ray,

You should narrow your search. For example, the "perfect" '91 NSX is going to sell for mid thirties. if you're keeping it under $30K, you're almost certainly going to be looking at cars with high mileage (at least 80K and probably 100K+) and/or automatic transmission and/or salvage title and/or accident history and/or generally poor condition and/or lack of maintenance. Which of these is acceptable for you? And are there any of the three colors that you would not be willing to buy?