Any suggestions for in-wall cabling?

I am going to build in our new house a multi-zone system, but a pretty basic one. Simply put, I am going to run stereo audio, composite video, and speaker cabling to all rooms. The speaker cables will be run off of amps from the processor, to the wall, then on to the next room through the attic.
I am planning on using high quality RG6 cabling to make the long video and audio runs. Not particulary worried about the sound quality in other rooms, because mostly there will be a lot of ambient and other noise in other zones.
Am I okay running RG6? I will probably run Monster Z2 Reference cables in my walls, as i can get MC stuff on accomodation.
Any suggestions? HELP!
* I don't think any run will be more than 50 feet. most will be under 30. Video will run into the wall, to the attic, through a multi-zone audio and video distribution hub, then back out to respective outlets. speaker will be direct.