Magneplanar 1.5 -- What amp???

I've been trying to get a freind of mine to try some,... actually ANY kind of panel speaker. I found some 1.5's here on A'gon that I'm having delivered to his home and I know he doesn't have a proper amp to drive them with. Since I've already spent $800 on speakers, I don't want to break the bank, after all this is just for fun. So, could I please get a few helpful suggestions about amping these speakers? I've never had Maggies myself, just Logans, so it'll be kind of fun for me too (and I don't have the room for another system).

Please, try and keep the suggestions under $1,200 used. I figured used is where I'm going to get the best bang for the buck. The cheaper the better. (I was thinking about a Threshold S200. Any thoughts on this one?)