Mitsubishi 3000gt, Toyota Supra(mid 90's) have been built to over 1000hp.. Mitsubishi Evo, Nissan 240, Nissan 300zx. Depends what you consider a cool car. Personally I would own any one of those cars and you can get pretty much any aftermarket part you would want for them. Subaru WRX/STI is another one that you can get lots of parts for.