I had a Serfas Seca 700x28 on my bike for a while, it failed after a couple of months with a cut in the tread and I have sworn off Seca tires. My current favorite is the Panaracer Pasela PT folding bead, or the Panaracer T-Serv if you prefer a black sidewall. They run about $42 each in the US and are solid, tough and fast rolling.