I'm trying to decide which tyres to choose for a LEJOG ride this summer. I currently use 25c Gatorskins, which are fine - they rarely puncture and are as sure-footed as it seems reasonable to expect such a skinny thing to be. But I'm thinking of changing for the big ride (well, a few weeks before it, so I get used to the new tyres). I want something fast but durable - ideally just as durable as the Gatroskins but faster. I'm happy to go down to 23c and was thinking about the Conti GP4000S. But would I really notice the difference in speed, or would it just be more punctures I noticed? Might I be better off just going for a 23c Gatorskin? Any others worth bearing in mind? Michelin Pro3? Vredestein Fortezza TriComp? Any voices of experience out there?