You could easily get an RX7 then put it back to standard. Most owners only change the exhaust and air filter. Type R, RB RZ etc performance is all about the same. The RZ is lighter so marginally faster but they all have the same power plant so in the real world you\'d never know the difference.
Have a search on the site for model guide to the RX7 and very comprehensive write up was done a few years ago.
If this will be your first performance car then take it easy, its a very fast and amazing car, when other change gear at 6000rpm you keep going to 9000 and that is seriously sweeeeeeeeeeeeeet!!!