Like others said, you really should try lots of boots to find what feels right before deciding on something specific.
The Attack sounds like a good option for you. 159 might be a little on the small side, but definitely doable if you want something a little smaller and manuverable. If you are looking for stability and float in powder, somthing a little bigger would be ideal. Example: Im 210 lbs and ride a 161.5 TRice. It's a good size for a do everything board, but in powder the ideal size would be a little bigger.
As for bindings, one option I would look at are the Rome Targas. I don't know many others because I haven't been in the market for bindings for a few years because I like my Rome's so much.