Replying to Filthy Rich Size Recommendation

I was looking at buying the ON3P Filthy Riches for the upcoming season. However, I'm not sure which size would be best for me. I'm 5'7" and weigh about 115 pounds. I would like to be able to jib around the mountain and just mess around with the 171, or would it be too long? I know that the Filthy Rich has a lot of rocker, but would it be too heavy for me only weighing in at 115 lbs? So should I go with the 171cm or 161cm?