I agree with the RX-7 and the Supra being the top 2. As far as the MR2 goes, I'm not sure if I would use it as a drift car, as mid-engine cars tent to want to spin rather than slide. The handling is too neutral. That's why pretty much any purpose-built race car worth its salt is mid-engine. Drifting an MR2 can definitely be done, but it could be done easier with the RX-7 or Supra.