I would go for 147-150 for you. i'm 5'5 and weigh 155 but i'm all muscle..not fat..lol and i ride a 148 noodle (signal park rocker with rome 390s). i'm in the park 90% of the time but i love to hit every natural feature i see on the mountain and when there's only flats...i love messing around with ground tricks.
for me..when in doubt, go shorter. less swing weight unless you're a jump guy hitting 40ft booters