I would buy the MR2, run that for a few years whilst getting used to the way the RWD car handles. Because the engine is in the middle it means the rear end is harder to catch, so you learn very quickly how to drive RWD correctly. That will set you up for a great entry into the world of Supras. A Supra is a beast, make no mistake about it. For the record, this is exactly what I did. MR2 turbo when I was 19, kept for 18 months and now I'm on my second Supra. I loved my MR2 and wouldn't have changed it for anything at the time.
Also, in my experience, anyone who says they are a good driver generally isn't.