Take a look at the Anthony Gallos and also Acoustic Energy Esprit line. They both would be good matches for the Denon.
One other consideration is the Energy Connisour (spelling) line. They are very dynamic for the money I have the C3's in my garage and they rock for a book shelf.
One other consideration is the Energy Connisour (spelling) line. They are very dynamic for the money I have the C3's in my garage and they rock for a book shelf.