WOW. I think it is over complicated with long runs. If you move your receiver to another location, you won't have wires where you move it to, so that doesn't sound like a good reason to have that closet in the basement. HDMI cables for that 30+ft distance, high quality is what you need, 22ga wire, gets expensive. Svideo may be far too.
You don't need all the speaker wires to go to the closet, then back to the 5 speakers where the main viewing location is. Zone two wires could go to the closet, then to the various rooms where you have the volume controls, not in the closet.
The closet will be less than 15' from the built in cabinet where the reciever etc. will be kept. The run from the closet to the tv will require about 20' of cable. So, I guess the distance from the source to the TV will require about 35' of cable.
As above.
The HDTV/digital video source would always "live" in the same cabinet as the reciever.
That may help with HDMI signals, a shorter path.
I guess I could run a larger conduit for cable replacement would 2" be enough?
Oh, yes, if the building dept allow 2", that is plenty. Or, multiple 1" flex conduits.
If I have to run 1" conduit, is it possible to run something like the "Residential Composite Cable" http://www.broadbandutopia.com/composite.html to the tv then solder the ends on? An electrician told he ran 5 leads (i think it was 5) of RG6-U and then attached a digital connector...
I appreciate your thoughts....
The RG6 type is fine for component video, interconnect duty, sub cable duty, VHS audio cable. You need Svideo cable if you have that in the VHS, or composite video, one of the RG6 types.
I would try to run the surround sound speakers from the receiver.