Gatorskins have been, for me, probably one of the most problem-free tires I've ever ran. They don't slip in the rain, they don't feel like ***** when skidding (unlike certain tires), they don't flat for me, and they're not heavy. I always run kevlar too, I think it's worth the added 7 bucks to have nicer feeling tires.

GP4000's, though, are the real jam. Too expensive to run on the rear though