If you want gears, I'd get the Air9. I found my One9 nicely stiffer than the Sir9 in the BB area, yet it was just as comfy(to me). I ride a small. An Air9 is maybe 1.25lbs lighter than a Sir9. An MCR closes that gap by maybe 110g.
I think Chris, at Niner, is that same height. He rides a small. You might get some tips on bike setup and sizing of stem/cranks from him.
I think Chris, at Niner, is that same height. He rides a small. You might get some tips on bike setup and sizing of stem/cranks from him.