Attention Denon 5700 owners

I have questions and was hoping some of my fellow 5700 owners have boldly gone where I havent yet.I am curious as to what it actually takes to get the 5700 to 6.1 channel or 7.1 channel status? It says in the manual about the 6-8 channel inputs for future formats.I was wandering if I could find a dvd player with 7.1 decoding and additional amplification for the extra channels if that would work as good in reality as it sounds in theory.Any of you guys attempted this? I am really not sure about this so any and all input greatly appreciated.The 6.1 and 7.1 formats arent worth the cost of another reciever but if its practical I would like to take a stab at it.I have only seen one dvd player with 8 channel decoding,I am sure that there are more than just one,so dont be afraid to list any and all dvd players you know of,that have 6.1,7.1 channel decoding.
Thanks in advance