I'm 5'9" and 145, do a bit of park but mostly all mountain and a little racing, and I ski 169's on both pairs of skis I own. The more competent and aggressive a skiier you are, the more length you can handle, and the extra length does give you more carving, more speed, and better float in powder, but a shorter ski is easier to control and turn fast for steep trees, moguls and such. Honestly, I like sacrificing a little float in the powder for the extra maneuverability, and with a ski this fat the float isn't really going to be an issue anyway. I don't know what exactly these skis come in, but I'd go with something in the high 160's to low 170's.Christophe V.- go 177cm, that way you will get good float in pow and still have maneuverability in the trees. 169cm is really on the short side for your height (I'm the same height).PS. These are no longer twin tips and I found them to be fairly stiff, unlike what Will stated.