The Panaracer RibMo has shown itself to be about as durable as a Gatorskin, but rides a whole helluva lot better, and they're a tiny bit cheaper than the Pasela PT. Put a set on the wife's bike in hopes of combatting the goatheads, and she has been flat-free since the day they went on. They also have no visible wear at all after ~300 miles, which is promising.

She's on the very cheapest ones-- non-PT wire beads.