You might want to consider Jadis and Gryphon Antileon Signature. They are known to be one of the best match for Avalon. Jeff Rowland is a good choice if you like their sound.
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I've listened to the Eidolons with Rowland and BAT, but not directly with the other amplifiers you mention. In my system, the Eidolons perform exceedingly well with Atma-Sphere MA-2 MKII amplifiers. The combination has superb soundstaging, is very dynamic, and reproduces instruments with a palpability that is often missing from many solid-state systems I've heard. Bass detail is excellent - deep, controlled, and very agile. Good luck in your search!