If you are using Dig Sat, make sure the cable is quad shield RG6 that is tested to 2.2ghz min. The higher quality Sat cables are usally alum foil & shld, w/ a solid center copper conductor. This is the best choice. Composite/CCTV signal is baseband and travels down the middle of the center conductor. DSS also throws power out to the LNB, which makes the solid copper better in that situation, even though it is a broadband signal.
Broadband CATV runs on the outside of the center conductor, w/o power, hence the lower cost copper covered steel conductor, but it will run fine on a solid copper conductor. Copper is a better conductor, just more expensive.
RG59 is used for dedicated CCTV ONLY, IMHO, and then it is copper shld and center conductor anyways.
Daron has it right on the audio, but I would make sure it is a high strand count or an oxygen free copper.
If it is a home theater, i would use 14ga minimum. Who actually knows what you will need for <Dolby DTS Pro Logic THX Digital 12.9 (sic)> or whatever they come up w/ in a few years. If it is just Multi-Zone Distributed Audio system 16ga HS/OF would be fine for runs under 100'.
One thing i have started adding to ceiling speaker runs is a cat5e cable, shilded is better, from spkr to keypad/Vol Cntrl, to audio headend, for IR control or distribution in the future.
mnmcomm
The best price is not always the best value