Best to get the BB with the crankset, the seller should help you.

M730, as a single speed ive used a 118,
for middle chainring chainline, on rohloff bike a 127.5 BB is right

And with wide chainstays, the arms clears the frame better.

very low profile cranks are designed to come in and meet a shorter BB.

IDK, about the specifics of Sugino XD600 Crank, not owning one.