I'm afraid that, for the most part, flat tires on a road bike (i.e. tires less than 28s) have nothing to do with tire durability. You can have a flat on a brand new tire if you hit a piece of glass the right way...
Some tires are lined with Kevlar. I'm currently riding on a pair of Schwalbe Blizzards (I think) which are about $20 each and they are supposed to be resistant, but I can still very well get a flat tire if I roll on a shard of glass, on a giant staple, or whatnot...




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