I've been trying these out.
http://www.serfas.com/product_details.asp?ID=633 I don't have enough miles to really say anything definitive, but they seem to be pretty tough. I'll give some more info when I have more info, but after running their Seca RS tire for a while, I'm pretty sold on their products. FWIW, I think they may be made by CST, but not sure.