The most popular choice for SBRcanuck would be the 50. However, the more contemporary coaches who 'upsize' would have you go with the 52, shift a bit further forward (taking advantage of opening the hip angle a few more degrees), and realizing a new reach number. I've found success with this in most every athlete who's been open to it. The stack is easily achieved on either size.

Cheers, guy!
Brad D