I've had Contis on, and currently Goodyear eagle F1s. I'm pretty impressed with grip levels especially in wet. Wear doesn't seem great but then it's a C63, not really expecting too much.
Very important to stick with the likes of Conti, Michelin etc I think as I tried Unroyal rainsport 3 on the rear of mine and as the grooves in the tyre are quite wide it made the car feel floaty until they wore down by a few mm.