I'd say if ur going to spring for a board just give him the cash or take him to the store or sit down and order it. He is certianly not even close to maxing out the potential of the board he is on, maxing out would be straight line bombing, presses, nollies/ollies, getting some 1 and maybe 3's off the small park humps in the vid and cruising switch...he looks to be at a solid beginner green and blue run level. And with that amount of snow....or lack thereof...he could be riding a 140...there's no reason for a bigger board. My daughter is slightly bigger 5'3" and 120, advanced/expert, riding 7 years at baker and can handle double blacks, duck line and bc. She rides a 144 is her park groomer board and she has a 148 she throws around and rides a 155 for deep pow. Your money would be better invested in more time on a real hill, getting SA vids or lessons.