Burton dis continued the P one I think. It is a bit heavy but I love the living hinge on the highback which is integrated into newer Burton offerings. It offers alot of support but still allows for lots of flex..very comfy and cushy but on the heavy side. It sounds like you have a good idea what will work for you. The freestyle binders I mentioned are great for park and pipe they just get a little sketchy when the speed increases and the snow get chopped up. I know lots of blokes on this site are high on Rome, and well as some buds of mine.
Surprisingly I keep coming back to the Burton customs. They seem to offer evertthing I am looking for most of the time.. Hey, if they are good enough for Shaun White? good enough for me.
I rode the P ones yesterday on a fast groomer day and I remember why I liked them in the first place for that application.