LAST EDITED ON Dec-30-10 AT 09:12AM (MST)[p]With a Rifle and if you have access to horses, mules, or an outfitter, I would do the Roadless unit. It is one of the better places for a horse-pack in hunt. If not, my second choice would be the bitter creek unit.
On the bitter creek unit, it is not too hard to get away from all the four wheelers and there isn't a deer hunt going during the LE rifle elk hunt to bring in a lot of people. To me, it is better than the Cache because of the reduced amount of deer tags/hunters. Even during the archery hunt, there are something like 300 tags total for deer on the books.
In all honesty, after labor day there are hardly any deer hunters left on the bitter creek side. I camped for two weeks right off the main road (Seep Ridge) on the book cliffs and hardly saw a person after labor day until I took my bull on September 14th this year.
With a rifle, your expectations can be a little higher. Probably 320-350 range, depending on the year.