Well, since nobody's suggested it yet, I'll go with the ULA Circuit. It meets all your technical criteria and, after using one most of this year, on trail and off, with loads up to 30 pounds I can vouch for its ability to carry loads up to that weight in complete comfort. I am almost certain 1-5 additional pounds would be no problemo, based on that experience, and it is about 10 oz. lighter than the Catalyst, which seems a bit like overkill-especially with your build. I am even more in that direction(5'8"/137#) and have tried on a friend's Catalyst-darn near swallowed me, but I wouldn't mind riding in it. Cheaper, too.