I had the Schwalbe Marathons on my commuter, in a 700x35. They were great, they rolled quite well and were good in the wet. If I can suggests though, a tire I found to be pretty quick is the Specialized Infinity. I had a pair on my MTB and they roll really nicely. They come in a 26x1.5 I think or a 26x1.75, and are decent is wet weather.