Hi, that's my system, ARC CA-50 w/Proac 1SC's, and it makes beautiful sound. Haven't heard the Cary, but I've been curious about SET's with these speakers. But you cannot go wrong with the ARC/Proac combo, in my experience. I also use a REL Storm III w/the Proacs and you cannot tell these are not full range speakers. Warm, detailed, musical, gorgeous on the jazz, acoustic, and folk LPs and CDs I play on this system.
Ooops, I see you are the same guy who posted the other thread on the 1SC's and an amp. Sorry for the repetition! I recommend that you call Frank Huang at Audio Outlet in Mt. Kisko, NY (website www.audiooutlet.com) and discuss the ARC/Proac combo. he sells both lines and highly recommended that combo to me. But he is very knowledgeable about tube equipment in general and could probably give you a good idea, at least verbally, of the sound differences you might expect.