I have the Michelin's M/S series on now and am very happy with them. I bought them used and have put 15,000 miles on them and they still look like the day I bought them. If the were available in larger sizes I'd be happy to own another set.
They are excellent in the snow, but you don't have to deal with that. As far as off road, I been in small runs of loose sand with them and they made it through it in 2wd, with the usual axle wrap.
-Ryan