I've backpacked in most of the CO wildernesses. Hard to beat the Weminuche for sheer size, few people and rugged mountains. The Needle Mtns in that wilderness are second to none. I took a Mtn. goat there many years ago with my recurve on a 7 day trip, and later did a 7 day loop in another portion. For enjoyment, I like the Flattops. More rolling country and many lakes- a different lake to camp at each night, all with fish asking to be caught and eaten. The vertical won't beat you up as most of the other wildernesses will.