I'm gonna have to vote Toyota, the 2ZZ-GE motor is strong motor that powers not only Lotus Exige/Elise but offers a factory supercharger thru TRD. It may not have the highest peak power, but it's powerband is much more usable and I'd bet most could not find a more reliable powerplant with a redline of 8400 rpms and designed to run all day at 4000. Of note, the motor was designed by Yamaha and they seem to do these kind of motors well
Also, the Honda F20/F22C1 that powers the S2000 is a great motor, but with limited production (meaning harder to find one wrecked to source the parts) and/or high cost of purchasing new from a dealer...the Toyota is cheaper to buy due to it being used in so many different models.