Way to go Chris, the Duo's are awesome loudspeakers! Great looking system too. I have a friend who has a pair modified with some local in store wire. He is running a GRAFF GM20 OTL amp and a Viva Linia pre amp. This is one of the best combos I've heard with Avantgarde, Vac's 30/30 300B is another punchy and sweet sounding amp all though a little noisy. I now that's a small room but I think the Duo's work best and sound the most LIVE with little or no room treatments, you get more of a delay effect. Something you may want to try in the future is to add some small but high quality back channel speakers, in stereo NOT 5.1 suround. At about half of the volume of your main system you get this amazing monster deep soundstage and an even more prenounced live affect. Here is a cheap tweak, put some tricycle innertubes under ALL of your components, even the turntable[under a granite base] and listen to what happens!
Enjoy the music,
Rio