C.T. - RG6 is just standard coaxial cable.
Here is a mile of it for about 200 bucks:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=67879&item=5764421887&rd=1
RG6 can be used to carry component video, s-video, composite video, audio signals, digital audio, and computer signals to any television you want. It is VERY inexpensive, and very good cable. It is rated by the cable company for HDTV, so you it will pull full bandwidth HDTV programming across it to any TV in your home.
No concerns on your part - wire your home with RG-6. The quad shield may add a little to the cost. But, this is stuff you can get at your local Home Depot today for a very reasonable price and online for even less. The labor of doing the wiring will cost significantly more than the cable itself.