Its mentally wet on the SDW at the moment, so you get the problem between cloying mud in the valleys and ice like slipperyness on the top, I'd go for a pair of Mythos XC, I've been riding the SDW for years and they've never let me down. They seem to have a decent mixture of grip and mud shedding ability. I'd not run the pressure too high, but if you're planning to do the whole route, then I suspect you might be messing about with it anyway.