I would look into an OTL amp by either Atmasphere or Transcendent. I believe the Coincidents have a fairly high impedence which makes it an ideal match for an OTL.
Tube Amps for Coincident Super Eclipse
I have just purchased a pair of Coincident Super Eclipses, and am seeking advice from my noble HI-FI friends on which tube amp to mate with these speakers. I would like to keep my price below $3500. I auditioned them with the Cary 300SEI and that was pretty sweet. Any thoughts?? Thanks!!!