i have heard the superswamper tsl's are good in moutains, mud, snow and wear good. they only got 3/4" tread though.
The bighorns are great but heavy and expensive. An alternative that has almost the exact same tread as the bighorn is the GBC Dirt Tamer. I have a friend that has dirt tamers and one that has the bighorns and they are almost identical and the Dirt Tamer is much cheaper. Only drawback is the dirt tamer is a bias-ply tire and not a radial.maxxis bighorns are highly rated but heavy. i personally use itp xtr radials with great satisfaction. the itp terracross look promising.