For the last few years I've been solo riding over potholed roads and my usual tires have been the Michelin krylion carbon and lately the pro4 endurance. Now I am stepping up my riding a bit and doing some quick group rides--roads are pretty mixed.

I am interested in trying a new tire that is a little more speed oriented but not a race tire. My experience with Michelin pro 4 endurance has been positive (except for a somewhat easy to cut sidewall) so I am inclined to try the pro 4 service course. People seem to like the pricier continental 4000s, though. Can people offer any insight into these tires, their merits as a "performance training" tire, and their value? I would be glad to hear other tire suggestions, e.g. is there a Vittoria that I should consider?

Thanks!