Be careful with the C-J as it's a bit fuzzy sounding and doesn't have very good transparency or dynamics - kinda the traditional C-J sound, in my opinion. I understand (and heard at a show once) that ARC's integrated from 6-7 yrs ago works very well with ProAcs. I almost bought the 2S in 1997 but ended up going for the 2.5s and found the 2S to be musical and engaging. However, I'd be looking for something a bit more neutral but still use tubes as they really do make the best music. Ever notice how no one ever says, "This new tube amp almost sounds like solid state! If you like the look of tubes but also like the slightly artificial sound of transistors, this may be the amp for you."