I love conti 4000's but they seem to square off on the rear very quickly with heavier riders.. I honestly find the Serfas Seca RS tire very comparable in performance and weight and they last longer and much more clyde friendly over time.. $58.00 per pair with free shipping is a good deal on these, they weight 215g.
http://shop.ebay.com/i.html?_nkw=ser....c0.m270.l1313