I have quattros and while the ARC stuff is definitely good it all suffers from use of global negative feedback. Also amps and preamps eeds to match well. I tried an ARC ref 3 in my system when I had Rogue m180s and it sounded awful; tinny and thin. I spoke with Johnny at audio connection and he said of course it did because the amp and preamp were a poor match. Admittedly, by using all ARC gear you won't have that particular problem but I'd also say you'll be leaving something on the table. I did a fairly exhaustive search on preamps and landed on a ModWright ls100. It's 6sn7 based which I really like as it has that tube feel but isn't syrupy or rolled off. It's crisp and clean and an excellent preamp with no global feedback. I paid 2500ish used. I then concentrated on amplifiers. Zero global feedback was the goal. Vandersteen makes their own now but they were cost prohibitive. Johnny steered me away from ARC as he really felt the zero feedback was key. I found a used pair of Atma-Sphere Ma-1s. Holy crap. The change was not subtle. This system with zero negative feedback sounds almost as good as the system Johnny has with a Ref6se, the Vandersteen amps and Kentos. My feeling is the difference is the speakers, not the electronics.
I know there's a lot of cache in having ARC gear but for me, particularly given the cost, it's not the stuff.