i just asked the same questions and here is the answers that I received:
use a 4 cond. speaker cable by parts express (partsexpress.com) it is built for high quality audio in-wall installations. it is also very inexpensive ($63/100')
as for the RG-6, i bought a quad shielded cable also from parts express that is suppose to offer much better sheilding for video signals
parts express was very easy to deal with and items arrived in a few days.
good luck.
use a 4 cond. speaker cable by parts express (partsexpress.com) it is built for high quality audio in-wall installations. it is also very inexpensive ($63/100')
as for the RG-6, i bought a quad shielded cable also from parts express that is suppose to offer much better sheilding for video signals
parts express was very easy to deal with and items arrived in a few days.
good luck.