McCormack DNA 225
Retail @ $2800, but you'll be able to find it for @ $2400.

McCormack Audio, in my opinion, is one of the true great affordably price equipment manufacturers. The DNA 225 is one Hell of an amp, and would do a wonderful job driving your Magneplanars.

But, if your like so many people who think all things audio revolve around speakers, try the new Magnepan 1.6's. Their retail price, I believe, is @ $1725.