I am a big fan of Burton bindings, so my suggestion would be the Mission if you can find them at a good deal. Good all mountain binding with some decent stiffness and response but not to much. If not, I suggest looking at Drake bindings, they make a really solid binding at a good price point. My only complaint about Drake's, I have found they are a little heavier but you probably wouldn't even notice.
The one place you should probably focus a little more of your budget, is on your boots. Comfortable boots can make all the difference.