Replying to Surface One Life Size

Making this one short and sweet, I am 5'8" and weigh around 130 pounds. What size of the Surface One Life should I get? I will be skiing BC pow and a very small amount of spring park with these, and when I ski park I do not do very technical rail tricks, I mostly do jumps. Lots of BC jumps, pillows, and other pow features. So should i go with the 179 or 189? With the massive amount of rocker, i dont want it to ski too short, but i want to keep it light, and keep the swing weight down. Also, im thinking the 189 might be too much of a ski for me especially if im throwing them around in the pow. Thoughts?