Snowboard sizing help!?

I'm a 135lb (Very lanky) 5'7" female novice snowboarder looking for a board that I can move up on. Right now I'm still learning but at the end of this season want to buy my first board. I plan on improving a lot and going frequently (I'm going to college up north) so I don't really have a restrictive budget; I want something nice that will last me a while. I've been renting boards from 150 to 152 and they seem to have been working out well. Is that too small for my height? I have been looking into the Burton Feelgood 151. People say it's nice and flexible and is good for both everyday riding and boarding the terrain park. Any suggestions? Thanks!