I like this board but i was wondering if...
I like this board but i was wondering if 159 would be big enough for me...im right around 200lbs
You would probably be ok. It's definitely at the smaller end of the spectrum of boards you could get. I certainly wouldn't go any smaller. And it is a wide board as well, so it does have a little more surface area than a regular board to distribute your weight better. Not much of a difference, but it is some.
I weigh 165 and have ridden a 156 before, which is as small as "they" say I should go, and felt fine. So I'd say you'd be ok. Go for it!