There's plenty of power products out there that isolate equipment from other components, digital or otherwise. For digital, you can use something like a JPS Digital AC power cord that helps prevent noise generated from the component from getting back in to the AC to degrade the sound of other components. Couple that with a line conditioner that isolates the outlets and you have a pretty effective solution. I know PS Audio is a popular choice for this. If you call Cable Company they will be able to give you a lot of ideas as to what's available at all price levels. They'll also send it to you so that you can try it in your system first before you make a purchase.
