VS, welcome. The Parasound Zamp that both Rick and Brandon mentioned is certainly a fine little unit. The review in the Audio Critic that was quoted in part is found in full
here , and is a very thorough analysis well worth reading.
It's probably more than you really need, however; as 2x6 pointed out, the power requirements in your situation should be quite modest. At your listening distance about a tenth of a watt would be used by the M3s for a comfortably loud average listening level; requirements for brief peaks would depend on the dynamic range of the material being played, but wouldn't be likely to be more than about 10 watts. So, it isn't likely that you need "BIG" watts or need to be concerned about "juice". A less expensive unit, even a regular HT receiver such as the Onkyo 504 for around $160(if you positioned it out of the way), would be cost-effective and could be possibly used in an expanded role in the future.
