I will recommend the Meindl Denali. They have Vibram soles. While I haven't hunted sheep I am involved with both of my kids Scout Troop's and after several years wearing these boots I'm way into the hundreds of miles hiking either with a daypack or an Osprey 65L stuffed to the max. I've never had any boot problems.
These boots did take a couple of camping / hiking trips to break in. In all honesty the Vibram soles still look great! I know the soles aren't Meindl, but these soles may outlast the actual boot.
