I was commuting on Bontrager Racelite Hardcase 25s on my six13. They were ok.

On my new commuter, my on-one dirty disco, I went with the Schwalbe Marathon Supreme 28s. They have been incredible commuter tires. They resist all the road crap, have had great traction in the wet and frost and built-in reflectors. I prefer the 28s now for my daily commute. I really don't notice much of a weight or speed loss between my old 25s and the Schwalbe 28s.