Razen: 1st, Wow, excellent system! (if I may use the word). As to yr question: IMO (and experience) you can drive ALL of the reasonably sensitive speakers with yr CAT combo -- the list is, believe me, long enough for a PhD. Anything that's phase correct (or more or less), reasonably even, & fast -- to do justice to yr electronics. What music do you listen to, and how do you like yr reproduction to sound -- not least, what speakers are you using now & why are they lacking...?
Among the brands (purportedly) used by Mr CAT &/or his dealers are: A-Physics, Symphonic-Line, Genesis, Quads, Avalon, Soundlab, the Bella Luna model (manufacturer?), Thiels (a variety, it seems), Sonus Faber... many others can apply. Take your pick, your only restriction is the room size!
