I tried a number of bindings with my X 169 last year. Bindings seem to make a big performance difference with this board. My top recommendations...
Flux sf45: great leverage and board control with these. Probably the best carving binding I tried but was a little heavy and lacked some footbed padding. Really good at engaging the camber zones.
Burton Co2, C60, Diode: Light, very comfortable, good padding. A good match for the raptor with the best overall comfort and board feel. Lacks some toe side leverage. The best binding for jumping I tried (get the reflex baseplate).
Ride SPI (or current model, El hefe?): I just picked these up a few weeks ago so I haven't tried them. I'm speculatling these will be good as well and right inbetween the above two. Stiff, relatively light, adjustable stiffness, and a nicely padded, canted footbed.
Whatever you choose I would get something that is fairly responsive. Something that has good side to side leverage and something that can really engage the camber zones.