mc452 c2600 mcintosh

Need a pair of speakers to complement my future upgrade to mcintosh mc452 and c2600 mcd550

price range around 8-12k, prefer new, but open to exceptional used

Mostly classical music, symphony and classical, i like high volume levels

Room size 18x18 sf

Aesthetics important, prefer piano black

I have a REL S5 sub as well

currently own Vienna acoustics mozart grand with ma6600 and mcd550, love the warm mc sound

also have a choice of getting used pair of mc601 for about $9000, how much of an improvement would it be over 452? I know it depends on speakers, but in general, is this a big jump in quality?