+1 for forced induction on the ZO6...see what it is capable of. You know what the Supra is capable of already, and buying a modded car is more often than not a bad idea...if it is modded, chances are the previous owner beat on it (despite the mods...they could only be asthetic and had a ricer beat on it) and you also have to question how well they put everything on the car and how much life everything else has.

Find how fun a ZO6 is with forced induction, then maybe start over in the Supra world later