I am the same height and I say the SMM! I am a small person so the SM large looked huge on me. I exchanged it for the SMM and that size is perfect! I believe there are pics of both bags floating around if you do a search. If you go several pages back on the pics only thread both bags should be there posted by me.
Would you suggest any other BE bag in Choc Matte? What's your view of the SMM?
Update- Did you love it?