Go bigger for your size, riding style and interests.
157 or 157.5 obviously makes no difference. Don't worry about the "ride this board 3 cms shorter bit" (it's the same with the Lib btw). You'll be happier at speed with more board. Plus a slightly bigger board will make popping off jumps slightly easier.
I'm 5'7 140 and I ride a 154 Lib TRS. Rode a 151 older TRS before and I prefer the 154. I'm not a rails guy, just jumps, hits and free ride.
Last edited by bamfb2; 02-18-2013 at 01:37 PM.