The size of your board is really based off personal preference, specifically in certain terrain and weather conditions. Generally speaking, a longer board can perform better in powder, as they have greater surface area, however, the speed, precision and overall maneuverability are not a great as as shorter board. I would think about where and how you like to ride, and if it's in the park and haulin' down the slope, maybe go for a 157. If you find yourself enjoying the powder days, then look into a slightly longer board at 160. But I would talk to a couple of specialists when you're fitting your self to your board. I have always gone into a pro shop and explained what I wanted, told them to pick the top three boards that met my needs and I would either demo them or pick the one I liked the best. Good luck and I hope this helped!