I am not convinced you would like the Keltiks after abandoning the 242s. As Paul has pointed out, they are a fussy speaker, but in the right environment with the right set-up, are magnificent. 242s set up ExaKt & Katalyst are splendid in every way: I am surprised you let them go so soon. I look forward to Linn providing an Organik upgrade for the AE 10 box.
As owner of 242, I must say that they are fantastic speakers but they are but very sensitive to an incorrect positioning in the environment, to a wrong setup and a source not at the top.
All is magnified in a context of multi amplification (exatk or analog) where all connections must not only be connected correctly but also the cables must have the same characteristics for all channels (ie all Silvers or all black), same length, same weld quality.
Patience in these cases is essential and every single little change in the system must be done one at a time, otherwise you risk not understanding anything.
This is true for all speakers, but the 242’s are more mangy in this sense, I don’t know why. Akubariks for example are less difficult in this regard, pity there is no longer the passive version.
But once they find the ideal setup, for me 242's are among the most beautiful speakers Linn has built.