It needs to be 3Ghz rated RG6 to the Hopper locations. Joeys's can be RG59, or non 3Ghz rated RG6.
Most quality cable is probably 3ghz capable, even if not officially rated, but if a tech comes out he may want to replace anything not labeled as 3Ghz. Bottom line, it's probably not worth trying to save a buck or two using non-rated cable.
Barrel connectors, cable ends, etc should all be 3ghz rated as well. Again, Dish tech may want to replace any components he's not sure about. Not as big a deal though as its just replacing the ends and not pulling a new cable.