I am going to play contrarian on this issue. I believe that the issue of Maggies needing tons and tons of power is overblown. If one prizes natural timbres, dimensionality, and is willing to live with moderate volumes and less than plaster cracking bass something like this will sound fantastic driving a pair of MMG's (no affiliation with sellers):
http://app.audiogon.com/listings/tube-quicksilver-m60-60w-mono-blocks-2013-10-23-amplifiers-83651
For even less money, and taking into account the issue of reliability due to age this is even better. I have heard this amp with smaller Maggies and the difference between it and something like a high powered Adcom is laughable. Tubes and Maggies with this budget is possible.:
http://app.audiogon.com/listings/tube-audio-research-d-76a-tube-stereo-75-watt-audio-amp-2013-10-23-amplifiers-60
http://app.audiogon.com/listings/tube-quicksilver-m60-60w-mono-blocks-2013-10-23-amplifiers-83651
For even less money, and taking into account the issue of reliability due to age this is even better. I have heard this amp with smaller Maggies and the difference between it and something like a high powered Adcom is laughable. Tubes and Maggies with this budget is possible.:
http://app.audiogon.com/listings/tube-audio-research-d-76a-tube-stereo-75-watt-audio-amp-2013-10-23-amplifiers-60