I usually start out with the DeLorme atlas for that state(I have several) and start narrowing down my choices. I look for extended ridge systems at the right elevation for the latitude. I look for areas with minimal road systems. From there I make several calls to F&G inquiring about population, access and hunter pressure.
I recommend you also gety a land status map from the BLM. These are usually updated every 1 or 2 years and show who owns what--NF, BLM, Military, BIA, private etc.
Once I narrow it down to 1 or 2 areas I buy the 1:60,000 series maps (1 inch = 1 mile)
Something to consider--hire a small plane to fly you over the area, especially if you have multiple spots in a given area you're interested in. Seeing the terrain from just a few hundred feet above shows things you won't catch on a map.