Interesting, I'd never heard of Magnepan before. Apparently the cheapest planar/ribbon speakers you can get. I'd be curious to hear them.
I've done a bit of research and listening to speakers in this price range. I'm building gradually, and decided on a pair of Rega R3 for the front ($795). I might have considered others if it weren't for my severe space restrictions, but for what I needed, I'm really happy. They're front-driven so I can place them against the wall, and look and sound great. I was also pleased to see that Hi-Fi Choice magazine featured them as a Best Buy speaker and had very nice things to say about their sound. The R5 ($1,195) has a 7" bass driver rather than 5", but with my Sunfire subwoofer, it didn't matter much to me.
My one dilemma is Rega doesn't really make proper surround speakers. The R1s are too big. So I'm considering either Wharfedale Evolution bipole surrounds and center, or Mordaunt-Short's Avant. I like the idea of keeping them out of the way on the rear wall, and they're actually made to be surrounds. I know some seasoned audiophiles would have a cow that I'm not matching the speakers properly, but I just don't see the necessity. I listen to music on two channel (screw that 5.1 SACD gimmickry), and in watching movies, the center speaker is the most important.
Other ones in the price range that sounded good were Paradigm, Monitor Audio and Polk.