Will you use for the track?
Did you get into modifying your Supra? If you're into that forced induction can be a lot of fun. Two great bangs for the buck are the STi and the EVO. They're both relatively cheap to mod and own. They don't have the high society stigma of a Porsche or BMW. You can take off the rediculous spoiler if you want the sleeper look. If you're unfamiliar with them you'll be very surprised at the performance. They're also very versatile and work good for a commuter if necessary, rallyx or taking a ski trip in the mountains/snow.
GT-R - Rumor has it they're bringing over a version either later this year or next.
Audi - Either RS or S models are fun to drive. They're a little too heavy for my taste.
Mini Cooper S. Don't underestimate this car. It handles like go cart and moves pretty good to boot.
2nd generation MR2 Turbo (forced induction potential). No car more fun in the corners.
Last generation Mazda RX-7 - Sex on wheels