Don't go by height so much as weight. Weight is more important due to the fact that it is the force which is placed into the surface area of the board. Heavier people need longer boards in order to absorb more of the force per surface area. With that said, there is an argument amongst magnetraction and reverse camber (banana) aficionados that these boards can be ridden 3cm smaller than usual. This is based on an argument that they have more effective edge. Think of it as if you took the board and then scrunched it down two to three cm, which would give it those wavy edges in the middle. The edges are still the same length, only the amount touching the snow at any given time is greater; hence, the argument that magnetraction offers more points of contact (7). However, in practice/reality it is all about how it feels to you. I still went for the 161 Dark Series.
I am an inch shorter at 5'11", but I weight 185lbs; therefore, my suggested size for boards falls between 158 and 162. However, some would argue I should shift that range over a bit, while others would say that it is perfect. Either way, smaller for freestyle and longer for freeride; and, of course, right in the middle for All Mountain. With that said, I chose the 161, because I prefer more free riding. I called up Mervin and they said a 161 Dark Series would be fine for me. The guy on the phone even said, "I am about 20 pounds lighter than you and I rode a 161 Dark Series just fine." Take that into account, as well as my review of the board and the fact that I weigh 15 pounds more than you (185 vs. 170), when you select the board.
And one more thing: You seem to have big feet, so look into a wide board if you get the Dark. I think T. Rice comes in one width.
Last edited by billygold18; 03-08-2010 at 09:39 PM.