A nice amplifier, I used the Aleph 3 for some years. That was the nicest SS amp I have used. I use the K&K too, just a wonderful phono stage is'nt it. I don'nt know how long you have had it, but the latest upgrade from Kevin, made a very big difference indeed.
Back to the subject, I have only used the Avatars and they were a good match with the Aleph 3, though that is a very different amp of course. In the end, I found them a bit lacking for me. I have heard Proac at length and Zu at a show. Both were good, the Proacs more neutral I think. I found Zu a bit bright for my taste. None were a match for the Daedalus DA-RMa's I use now, but above yoor price range and they never appear second hand. Good luck in your search.
Back to the subject, I have only used the Avatars and they were a good match with the Aleph 3, though that is a very different amp of course. In the end, I found them a bit lacking for me. I have heard Proac at length and Zu at a show. Both were good, the Proacs more neutral I think. I found Zu a bit bright for my taste. None were a match for the Daedalus DA-RMa's I use now, but above yoor price range and they never appear second hand. Good luck in your search.