well i went with the 155 "short track" hope i made the right decision, have been riding 160's for quite awhile now. hoping the lighter weight and thin design keeps it moving through the snow without the need of the longer track. have been noticing seems the higher track speed of the shorter track keeps the sled wound up a little more and gets a better mark on the hill. hoping i'm not gonna be kicking myself the first time in 2-3 feet of pow. when we ride i'm usually in front, or at least as much as i can be!!! and i've found the longer track to be a little more forgiving in deep powder situations... 431 pounds of pure heaven!!!!!!!!!!!!!!!!!!!!!!!