Hopefully this thread is alive as I am in the exact same position with the ARC or Aesthetix question. I currently have and ARC LS-15 and Rhea Eclipse with Manley Mono's and Maggies. I'm looking to upgrade my preamp with the 6SE or Calypso Eclipse. I have no complaints with the current set up but hoping by now that some of the people in this thread have made decisions and can share their experience.
Thanks