The Klouts by far is a better amp. I have an Ikemi, Kairn-Pro, 4 Klouts and Keltiks. I plan to buy a AV-5103 and use 2
more Klouts I own, Aktive center channel (Ekwal) and pasive
surround (Katans). Since you will be changing all 4 amps you might want to consider the new 2250 amp. I do prefer the Klouts but some Linn fanatics do like the 2250 more.
Check with your dealer on the Aktive cards issue, the Klouts uses mono card, I don't know if the 5105 uses mono or stereo ones. If the 5105 uses stereo Aktive cards, the 2250 will end up costing about the same as Klouts and new mono cards.