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You are making your life too complex with too many requirements. You may also be trying to 'baby' your electronics and speakers by not using them all the time. Dont.
Simple: use RF to the TV for casual TV watching.
Critical: run Left/Right/Digital sound to the receiver and video to the TV and use the receiver.
WARNING: the digital output on many CATV box's only works on their 'digital' channels (ones over 100 on many systems). This means you need to hook the optical connection to the receiver, and the L/R audio to a DIFFERENT input. Then you have to switch inputs on the receiver as you cross the channel 100 boundary. This alone may make you do all your channel-surfing with the RF feed.
Unless you live in an area with lightning or lots of power outages, you can leave your receiver on 24/7. It stays ready but only eats major power when you are using it.
Hope this helps.
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