Hi Olaf,
If you are particular to Class-A Accuphase, then yes I think in your sized room, A65 would be just about perfect, if as indicated, your E-560 is driving the V3s nicely now. Surprisingly, REF150 could not extract V3s full potential (espc.the lows) even though my brother's room is quite small, similarly around 4m x 6m.
IME, the A-Accuphases usually sounded/and is, way more powerful than what their ratings would indicate. Given right cabling, their A-200s manage to dig down deep with excellent control and grip, with mids and highs that are simply beguiling ~ I can understand as to why you are hooked..
