If I was going to get a freeride board that can do natural hits out of the NS lineup it would be the 163 Premier. If I was looking for a stiff all mountain deck that can handle speed, switch, and a lap through the park jumps I'd get the Heritage. It depends on what you do more of, but it sounds to me like the Premier is more fitting. I'm about your sized and I'd probably go with the 163 or 165.
Thats what most people tell me but the longest board Ive owned is a 162.. I do like how light the heritage is, the premier is sick tho. I couldnt find any used boards so im biting the bullet and buying a new one I just want to make sure I get the right board. This would be my first NS Ive only owned Libs and GNU