Are you seriously asking, or just kidding? After all, don't you have three of their amps already?
You're packing some serious power with those amps that you won (two XPA-1s, right?), and the soon-to-arrive MPS-1 is no slouch.
If I were to try to sell it, the number that's in my head is $700 + shipping. The thing is mint, and I have all of the original packaging. I go between wanting to be rid of it, and just taking it apart to look. The hum, which bothers me but my parents didn't notice, is the only negative. The thing really is built solid and looks nice, too.