Try a set of Continental Top Contacts. Not cheap but well worth the price IMHO. I've got a set of 32's on my Coda Elite right now. I wore out the Vittoria 28's that came on the bike, then wore out a set of gatorskins 25's, then wore out another set of 28's, also gatorskins and decided to try the slightly larger Top Contacts. Comfortable ride, very comfortable indeed.
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It's all downhill from here. Except the parts that are uphill.