Well I have an older MR2 so maybe I can provide some insight.
The MR2 Turbo was available in the United States from 1991 to 1995. '95 models are quite rare (for a non-supercar), with only about 380 imported to the US that year. They are still commanding higher prices ($25000 for a nice low miles example) than earlier years.
With a homemade manual boost controller they will run low-mid 14s in the quarter mile. Not quite NSX territory but these things are a bargain in comparison. Handling is quite good on 93-95 models - very stable. Earlier 91-92 models had more tail-happy suspension characteristics. Some people prefer the early suspension, most seem to prefer the later changes.
I've only had a brief drive in a 93 MR2 Turbo and a 94 NSX (5 minutes each), so I can't really give you a comparison in terms of driving feel and character at the limit. The MR2 Turbo is a pretty luxurious car, though, in many cases. It's quiet on the freeway, smooth, and all that good stuff. A marked contrast to the spartan, simple, noisy MKI MR2. I felt the power steering in the MR2 Turbo to be too isolating, however this could just be the fact that I'm used to some of the most direct steering on the planet. That was probably my biggest gripe with the MR2 Turbo.
You can learn just about everything you ever wanted to know about the MR2 by visiting
www.mr2.com .