+1 for minions. dont get dual ply supertacky rear unless
1) youre going to the alps
2) you enjoy riding with what feels like a punctured tractor tyre.
I'm keeping a minion on the front, and swapping between a minion and a crossmark rear depending on the conditions. single ply kevlar 60a compound minion is a good allrounder, not too heavy.
check out http://www.nextdaytyres.com for good prices and quick free postage (see "online tyres" thread, lots of votes for them).
one of the mags recently tested mud tyres and raved about using the minion F on the rear for mud.
The High Roller is well regarded but I dont trust it on the front as much as a minion, think it makes a better rear than it does a front.