im buying the 08/09 obsethed and wondering what length to buy? I ride alot of Big Mountain and BC, and booters in the BC/park. I need something that will work good in pow, glades, BM lines, pillows, but also something i can spin on. i was thinking 189's/bindings at +3? I'm 6'3ft 170lbs. I cant decide between the 179's or the 189's? Suggestions..