Continental Top Contact. They came with the bike, and have so far proven stellar.

Michelin Pilot City. They were inexpensive, provide awesome flat resistance, and my OE Kendas flatted four times in one week.

Schwalbe Marathon Winter. Because I ride in the winter, and I don't like to fall down.

I would like to try Panaracer RiBMo tires. They are light, provide puncture protection, and are well reviewed. Plus I like to say, "RiBMo."