The choice of Dynaduio Contour 3.3 or Confidence 1

The 2nd hand price of the above speakers are almost the same. My power Amp. is an Accuphase C275V+A47. My current speaker is Dyanudio Contour 1.3 SE. I have intention to change my speaker, the above two models might be my good choice.  But I am afraid the Contour 3.3 might produced too huge sound when juding on my listening room space which is 4mx6m. And it is said that the C1 is hard to find a good amp. to push.  Considering with the using of my current Amp. combination, which speaker should I choose?