The answer to that question depends on how much you want to spend. And how you define the word best.
Turbocharged versions of the Toyota Supra, Nissan 300ZX, Mazda RX-7 (which is turbo only) and Mitsubishi Eclipse/Eagle Talon twins all offer more power and quickness. And with the exception of Eclipse/Talon, all have rear-wheel drive, making even the non-turbo versions a little more agile in terms of absolute handling.