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Hmm...I'll take a rather different approach.
Porsche - is a fast car but is so ugly I won't even compare it to my NSX. When you are cruising down in your NSX on Sunset Blvd. in Beverly Hills all these chicks in their Jags and CLKs look at you like you are Tom Cruise.
Viper - A friend in Oklahoma has an RT/10 and he hates it. He says it turns heads but the car has no sophistication at all. Its just a big chunk of Iron. He says the car handles worse than his BMW 325. It gets out of control when getting on the freeway. This guy and I used to race together so he is not your average driver either. My NSX glues to the ground till you feel all the G's pushing your guts in.
300ZX - I would compare a 300ZX to a Supra not corvette, not Porsche not Ferrari certainly not NSX.
Supra TT - Yep! an awesome car, I had it for 2 years very reliable too but again don't compare it to an NSX. Its just two different calibres of cars.