What model Denon is that coopasonic? I've been looking for a receiver with multiple component inputs, but the most I've seen (at a reasonable price) is two.
I'm currently using an Audio Authority 1154 component switcher - http://www.audioauthority.com/1154pr.html
- it allows for four component devices with either analog or digital audio - there's no remote, but it'll automatically sense the device you turned on and switches accordingly. I have mine tucked behind the rest of my equipment and have never needed to get up to switch devices. It's not bad for the price ($175 when I bought mine last year)