omg, my weight has fluctuated quite a bit in the past year, hasn't it? I'm currently 135 lbs., same height.
@joannegiven, my Burton Lux was an OK board...not great, but OK...did the job while I was a newbie rider. Stable, serviceable, kind of like driving a Toyota Camry. Burton has since changed the camber profile on the Lux (the one I had was traditional camber), so it's a probably different kind of ride now.
Cadence is a fun board. Haven't been able to take it out this season yet (no snow until recently) and ride it more aggressively, so I can't really comment on how it does in that respect. Mostly rode it last year to play around on the mountain, ride powder, and survive the long, flat cat tracks. 147 is probably the right size for you. According to the Arbor website, the current model Cadence 147 tops out at 156 lbs (71K) and the 151 tops out at 164 lbs (74k).
Lilfoot (another poster on the forum) has ridden a bunch of boards and has some good recommendations. Just search the archives for her posts.
@crazylegz, what board did you end up getting?