The Onkyo is rated at 135 watts/ch, so most likely you will never need additional power that you may never use or recognize anyway. The m60's or m80's do not require a lot of power to play VERY loud, so in the majority of situations a receiver of even 90-100 watts would be fine, even in your room. Keep in mind that doubling the wattage, only gains you 3dB's.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85