What snowboard should I get? Rocker vs. Camber?

I am looking to upgrade snowboards soon. I consider myself an intermediate rider. I don't do the park thing...I'm looking for an all mountain directional deck. I would like to spend under $600 (I already have the bindings and boots). Also, what are the pro's and con's of the new rocker boards (I've never tried them). I mostly ride groomers (almost no powder days in MN). Would a traditional camber board be better for my use? Any help is appreciated! Thanks....