You might wait to see what tags get left-over on the second draw in Idaho, since you are willing to spend the money on out-state tags, you could try to draw a better than otc tag.
The 4wheeler is a good option in 39, they have a lot of roads closed to full-size vehicles. You should check with the National Forest district for that area because they will give you a road access map, for what you can drive when and where. Unit 43 and 46 might be a couple other places to look into. 46 is in southern Idaho and borders Nevada and more sagebrush country than mountains, I've never hunted there, but they pull big bucks out of the units that border it.
newguy220