Isophon Cassiano with diamond tweeter

Hi everyone,

I just wanted to repeat the issue that I might indicate in other topic concerning preamplifier/poweramplifier. However, this is to get a different point of view and advice from you guys.

I currently own Isophon Cassiano speaker with diamond tweeter. Gryphon Diablo and a pair of Accustic Arts Preamp I mk3/ Amp II mk2 are being considered to be accompanied the existing speaker. Have you guys enjoyed the Cassiano speaker? Can you advise me to choose either Gryphon or AA or maybe an amplifier else for the best combination?

Thanks!