I have a Rome Machine 157, and I'm 5'10 and weigh 135 (like 145 w/ gear). All the 156-57s I have demoed in the past work well for me. For you, I think 157 will be allright for length, and the MTX will add edge hold (I think), but just for park + tree. It will probably be pretty good in the woods, but a little less forgiving in the park b/c you will really have to avoid landing tail-heavy. Overall, I think you will be okay, but get a longer board if you are interested in all mountain.