I personally love boost. So an older wrx (like a bug eye) might be in the 14k range. 03-04 cobras are most likely out of range, but a late 90s might be around that. RX-7s, well you know more about rotaries than I do. I looked at GTO's last night, the cheapest I found was 18k for an 04 then everything else was 20k+. with say, 12k (after deductibles) You could get a 300zx with some money to spare to do what you want or just have cash in your pocket. You could also get a nice S2K, if you like those.

Good luck with whatever you get.