Whatever frame you get, make it a size BIGGER. It looks like you are not too tall for a 650B. Mid 40s tires would be good, IMO.
I think 650B is taking over in Asia. The overall length will be maybe 2" shorter, helps with alternate transportation.
My CCM 3 speed is 650B x38. Definitly feels nicer than the 700x36 I've had on most all the bikes I've ever had. I do centuries on it, easy as pie.
I still got by with 36 mm tires on wet clay in China. My Dyad rims are only good up to 38.