I'm new around here and I've just read this thread with great interest (partially, I'm not crazy :-P).
The thing is that I've seen the duel with music and that has made me remember a very old edit attempt of mine. I also used music from the PT, including Battle of the Heroes. Here is the very rough result of that experiment (original music can still be heard at some points). I thought you might find it useful in your consideration for the music.
Rapidshare (Quality is not so good)