There are two types of signals we are talking about here and I haven't really seen anyone else seperate them: one is video (I am assuming component) and the other is the RF feed to the converter boxes.
For the feed coming in, especially for digital satellite, RG6 is the go to cable. Cable TV uses a smaller bandwidth than digital satellite so it is more forgiving. The best RG6 cable for satellite (since DirecTV for example uses frequencies from 5hz all the way up to 2.8 ghz!) a solid copper center conductor and quad shielding is recommended. There really isn't a "best RG6 brand" but a best construction which I mentioned above. Along with the proper cable you also need to use proper 3ghz linear compression connectors and everything in the signal line must be rated for 3ghz as well (splitters, multiswitches, barrels, etc). The final thing to pay attention to is the physical installation of the cable; stay under the max pull rating, maintain at least minimum bend radii, etc.
For video signal RG6 is really overkill. I know mentioning overkill on this forum is going to get a few laughs, but there you go. My favorite video, audio, coaxial digital audio cable is Belden 1505a Serial Digital RG59. It has more than enough bandwidth for the video signals, is smaller than RG6 so installation and rack wiring is easier, it holds its shape and bends well, and it rejects skew and signal attenuation for greater distances than standard RG59.
I hope there were a few tidbits in there that will help you out.
2-Channel System (the pool room):
Carver C-1 -> Soundcraftsmen MA5002A -> Martin Logan "The Sequel"
Also Onix XCD-99 -> Parasound TDQ-1600 -> Squeezebox Classic