You might want to look into a NuForce 9 or a used Spectron Musician III at that price. Both very good with the power and current demands of the Magnepan planar speaker.
I use to run mine with a Spectron Musician II. Class "D" amp and well under your budget used. You could step up to the III with a little money than your budget. The II puts out a lot of clean power @ 650 wpc. The 3.6's thrive on a lot of good/clean power.
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