I wish I could get some seat time in something like a Lambo for a few laps, but in all honesty, I'm not sure how much fun those supercars would be on a track. They look more like Bahnstormers. Poor outward visibility, massive chassis with Hummer-dwarfing widths do not make for track fun. Drive an old 911 on a track to find what FUN is. Great visibility boosts confidence greatly and makes apex spotting easy. No worries about trading paint with some guy you never knew was there. Also, the limits on those supercars are SO high, you have to be moving at a truly frightening speed before the car begins to work. The consequences of going off at 250km/h are much worse than at 150km/h, no matter what you're driving.
Track cars:
1. Mazda Miata. Still RWD, still great.
2. Honda S2000. Yes, it's fast, but not so fast that you can't have some fun without risking your life on every corner.
3. Porsche 911. Newer ones are not as tossable and fun as the pre 1990 models, but still has lots of glass, trim size and short wheelbase.
4. Subaru STi. Want to look like a hero, have a blast and drive your race car to work? The older STi's make great track cars. Upright seating, lots of glass, tunable tossable chassis, AWD. Yeah, baby.
5. Mitsu Evo. See Subaru STi.
6. Go RETRO and find a Porsche 944 turbo. Probably still one of the best chassis every to have tires bolted onto it and the car is so well balanced it's unreal.
7. Supercar fun? NSX. Saw one on the track at a PCA meet, and what a hoot. Good visibility, reliable, brakes like you tossed out a giant anchor. I could NOT believe how deep the NSX could go into corners. That alone would make it a fun afternoon.