mc452 vs 601 vs. pair mc275 for classical music

I have a choice between a brand new mc452 vs open box 601 vs two mc275 for around the same price 

preamp choice of c2600 vs c22

current speakers Vienna acoustics mozart grand, mcd550, ma6600, and Rel S5 sub

i like the warm mc sound of my current system

will likely upgrade speakers, but don't know which ones to get

my room size is 18x18 sf

choice of music mostly classical 

would appreciate recommendations from those who have the above setup