Amp for B&W 706 s2

Hello there. I recently bought these amazing (for me) speakers and for now they are driven by a denon avr 660h..so its a little weak for these. So i'm planning to buy a stereo amp. The budget is low...max 800 euros (i live in Europe-Greece). At this price for brand new i have found yamaha nr 803d (800 euros) but i have also found an almost new nad c375bee (it has mt1 on..for tidal etc) for the same price (and i know the person who sells it). What do you suggest?? Thanks in advance!!!