In reply to Little Rascal:
I'm quite a fan of the Merrell MOAB for a summer boot. In particular they stick to anything, be that mud, wet rock or whatever, despite the grips not looking much.
Only downside is that they don't last as well as they perhaps could, but that's the tradeoff you get for a softish grippy sole. I once tried a pair of Brasher Fellmasters but ended up selling them because while they were comfortable and supportive enough the relatively hard sole didn't stick to anything and I had no confidence at all in my foot placements.