to your other question on what to run, here is what I'm doing:
for my home theater:
1. to the projector from media stack: hdmi, component, dvi, s video, and then a smurf tube for future proofing
2. to the 5.1 speakers, 12 gauge wire
for each room of the house
(2) rg6 coax cable
(1) cat 6
(1) cat 5e for phone
Basically, what I did was rather than try to attach coax to HDMI to cat, is to have each room have a drop for each type of cable. I know some here have done HDMI over cat or other type of stuff, I just kept mine basic and simple.
also, I didn't see any mention of having a central location where all of these above cables "home run" to. Having a central location where all of this stuff feeds into allows you to easily "patch" one room with video, another with internet, etc...
This is probably after the fact since it sounds like you already to sheetrock, but hope it helps