If you're close to a copart, I have another idea. Watch for a recent Polaris Slingshot (not the earlier GM engine). The Polaris should be light, the ECM and harness, etc. and Miata transmission in one shot. 210 horses with factory reliability. The people that buy them crash with incredible frequency, so copart has a bunch. Alas, it may take a while to find a stick shift as most riders choose automatic.