http://expeditionportal.com/where-the-r ... -the-road/
I'd recommend the Cooper Discoverer AT3, as it seems to do the best on several tests that I have seen. If I were replacing my tires today, that's what I would go with. I know a few guys who run them and love them as well.
Personally, I went with the Toyo Open Country AT2. They do very well under all conditions and I really have no major complaints about them at all.
A lot of guys really like the Firestone Destination AT, although personally I'd only go with those if I could get the Coopers or the Toyos.