Jwaugh-I have avalon Eclipse and have tried many amps with them. I borrowed a friends accuphase a-50v for a short period of time and it was by far the most tube like amp I have used. JRDG amps sound very good with avalons. I have yet to hear Halcro's with them-though I can't imagine it would be anything less then amazing. I myself use a BAT VK60 and love it and am thinking of upgrading to a VK-75se eventually-and I have plenty of power. You may want to consider a Convergent audio JL-2 tube amp, a truly great tube amp at a remotely affordable price. If you don't think you will like solid state-chances are you are right. BAT VK-150se mono's would work well with your situation, in fact for the moment you could pick up a VK-75se and then when you get Eidolon's get another(VK-75se) and then make them mono's. Most feel that avalon's need high current solid state with gobs of power, I don't agree-and there are a few other members here that run avalon's with tubes and insist it is the only way to go-it boils down to if you are a ss or tube guy.
~Tim
~Tim