There's a couple of other ways to do the west buttress route. The spine of the west buttress disappears into a 4th class headwall near the top. I haven't done this yet, but I know someone who has. Another way (that I've taken) is to traverse left (north) at the point where the ridge goes into the headwall across the adjacent couloir to the slabs near the summit. There's a couple of easy class 4 moves to get out of the couloir and class 3 to the summit from there.
It is also possible to descend (or ascend, I suppose) via the south ridge to "W" couloir (look at a picture, you'll know why it's called that.), and then down the couloir to the base of the mountain. The couloir forks a short distance from the "W", and either fork goes, but they're both pretty steep. You don't need a rope or rack for the west buttress, or "W", but a helmet wouldn't be a bad idea.
San Juan Range