Schwalbe Marathon Supremes are by far the best tire I've used for commuting. I run the 700x40 and with the kevlar bead they are reasonably light and easy to manage when fixing a flat. Rated to 85psi I regularly run mine at 100psi and have gotten 2 flats in six months. Living in SF where the streets are pretty beat up and with a construction site at every corner, these things roll right through it all. Good choice and good luck!