I'm in the same boat, riding on the stock Schwalbe Lugano that came with my CAAD10 105. My friend suggested the Schwalbe Durano b/c it's a better tire with low rolling resistance and has good puncture protection. I looked it up and it's much cheaper than the Conti Gator Skins. I don't do any races, but I do enjoy my weekend rides (varying rolling hills, usually 40-80km in distances). Anybody have suggestions/recommendations on a durable, speedy tire with good grip?