panaracer pasela tourguard is a popular well-priced tire. thats what i run, at about 100 psi. i'm very happy with it. i use size 700c x 32 but you may need to check what size works with your wheel. there's a sizing chart here. imho, for commuting the wider the tire the better cuz it will absorb bumps better. my next tire will be a 700c x 35.