I drive M3's in my small home office, with all audio sent from my Mac, with this:

http://www.amazon.com/gp/product/B005F5U86G/ref=wms_ohs_product?ie=UTF8&psc=1

It's perfect for me. Tiny, silent, cool, nice looking and, so far, flawless.

Quite limited in power, of course, but more than adequate for my needs and maybe for yours, too.

I use the audio out port of my Mac Pro, but of course for wireless use you could just add an Airport Express.