I second the Squeezebox. It's a great little product.
Yes, it does have (analog) RCA outputs. It also has optical and coax digital outputs for using your own DAC.
Wired will always be more reliable/secure, etc, and 80 ft of cable should cost less than $20. (See http://www.pacificcable.com/PatchCables.htm, for example of Cat 5e cables in long lengths.) However, depending on the situation with walls in between receivers, distance, etc, you might find wireless to work very well for you, too. And it's no extra cost with a cable. The Squeezebox will do both wired and wireless.
Michael
Yes, it does have (analog) RCA outputs. It also has optical and coax digital outputs for using your own DAC.
Wired will always be more reliable/secure, etc, and 80 ft of cable should cost less than $20. (See http://www.pacificcable.com/PatchCables.htm, for example of Cat 5e cables in long lengths.) However, depending on the situation with walls in between receivers, distance, etc, you might find wireless to work very well for you, too. And it's no extra cost with a cable. The Squeezebox will do both wired and wireless.
Michael