The idea is to match the amp/pre with the speakers. You might be wasting 245 watts of amplifier on speakers that really would sound good with 25 watts or less.
I had a 30 watt class A amp that far out performed a 200 watt mono blocks especially the bass.
A good idea to decide your listening position. I would not think in terms of "filling " the room. You don't want a PA system. Micro details and dynamics are special if you can get there.