Depends on your budget. If you want the best and has the budget for it, then go for Michelin PS4. If you want the best value for money, then got 2 choices now: cheapest is the Hankook V12 Evo2, or the very new Falken FK510 which should be just slightly more expensive than the V12E2 but also should be slightly better.
Slight correction, for Continental you can also go even better than MC6 with Conti Sport Contact series or the Extreme Contact Sport series. UC6 btw is a low end model only, not good for performance.