Michellin Pro Race 2 700x23, I chnged the rear tire after 2,200 miles, but still have the same one on the front. To tell you the truth the only reason I put a new rear one was of so many cuts and scrapes from the road or else it would still be clocking more miles.IMO they tend to have some lateral flex after 1,000 miles, for me the main center lining is solid, but the side walls a little thin. They seem to be built for light riders, I am 170 with 23 tires and still feel they could be a little stiffer. They are a pain to install, super tight fit.
I have become partial to Vredestein Frotezza TriComp 700 x 23c. I can put 145psi in them and seem to get better life and wear out of them. My lbs ran a special 2 tires and 2 tubes for $80.00. I have atleast 3k on my front tire, am on my 2nd rear and am using the 1st rear for the trainer. Ride quality seems to be good, but what do I know.