You can never have too much power. Going from an entry level Pioneer receiver to a dedicated Parasound multichannel amp made a significant difference in sound quality in my M60s. I'll never go back. Granted it depends on room size, how loud you like it, listening distance, etc. I can't see how one can not tell the difference in sound quality.

M60|VP150|2xQS8|PSA XS30+Epik Empire|Pioneer Kuro 6010FD|PS3|Denon AVR-X4000|Parasound 5250v.2|