If you want to ride waves, go with the 150. If you are more freestyle oriented, go with the 140, or better yet at your size, go with the 135 - the 2012 models are on sale, talk to your dealer about one.
I’m slightly heavier than you (80kg/175lbs) and use the 150 wide as my main board. If I ever break or lose it, I will buy another one instantly. It’s just such a brilliant all-rounder. I have a lot of fun in the waves with it and whilst it can’t match a directional, it gets me in (and out) of stuff that I might not otherwise make. Whether this is a good or bad thing, is subjective. It can even handle some freestyle stuff. I do front/back rolls, raileys etc with it. I can’t load up the edge as strongly as I can with the Zen, but I tend to only take that one out at flat water spots. I’d agree with Ned that the 140 will be more biased to freestyle or lack of waves.
After some really epic sessions in the waves on the 150 lately, I’ve wanted to hug the person that designed it.
I like the 150 so much that I have two. One in the family summer house in Portugal and one where I live the rest of the time (Denmark). That pretty much says it all about what I think about this great board.
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