I love my Step-Ups. They're sick for jumps and rails. I'm 5'10 and 160lbs, so I'm not near the same size as you, but if you want a dope park ski in a jump focus, it's hard to beta in my opinion.
I'd almost go toward a 177 if your growing. The only down side is that they are stiff and may not be as "fun" as the 166. Another option could be the 177 Afterbangs. At your weight and height, they would be just fine for jumps. But, if your set on the Step-Ups, get them.