Thanks OldTimer, I didn't list the regular network / coax drops... but that was step number one! I'm actually running one drop with four cat6 and two coax to each major TV installation, and most other rooms have at least one drop with two cat6 / one coax... with the larger rooms / bedrooms having two drops on opposite walls.
In my previous house I ran just 2 cat6 / one coax everywhere... but that meant that my TV and my office needed additional switches to hook up everything. This isn't terrible (and in some cases can even be desirable)... but I want to be able to avoid it if possible.