RX7 all the way. The winner of the last 3 Targa New Zealands has been a lightly modified RX7. And the field consisted of everything from R34 GTR N1's to GT3 Porsches.
They are heavily underated cars, but a little resurch into thier achivements shows that are really a super car in disguise.
Then the NSX, but only becasue its a little to civilised, then the 300zx and the 3000 I put in the same boat, thier a little to heavy for my taste, and the WRX bringing up the back of the field. Simple because all the other cars are purpose built sports cars, while the WRX is still a 4dr shopping cart underneath. They also have a very limited top speed, most of thier great performance comes from short gear ratios.