If you're not into jumping(not just limited to parks), and just want speed I think the 164 would be ok. I think weight is just as important as height, and I'm only 175lbs and my freeride board is a 158. What have you been riding? Its always nice to demo first when possible. The nice thing about buying a big name brand (if you must buy Burton), is that there has to be someone near you that rents or demos them. As far as your width, I don't think you'll notice 2mm much, but bring your boots with you and have a look.