Chuck, the Rotel is conservatively rated and would have plenty of power for your M22s, but so does your THX certified 777. The separate amp is highly unlikely to make a significant improvement; save your money. Although the power is fine, the features on the 777 are getting a bit dated(e.g. no DPLII, etc.) and if you want to get something, a new receiver with up to date features would be one way to make a better use of the money.

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Enjoy the music, not the equipment.