Walls are a pretty good park ski, but if you ski more out of the park you should have looked at the bridges. Don't go anywhere near marker bindings, People are excited for the Jester but nobody has really ridden them yet. If you can get Rossignols bindings try to get a pair of FKS120's/FKS155's depending on your weight.
Depends on your skill level and what/where you are going to be skiing, if its going to be exclusively park than I would say 177, 185s are going to be harder to throw around. If just a little park, than the 185s.