Bel Canto Pre 6 Gen 2, better than any of the options you mentioned IMHO unless you really want the tubes in the Copland.
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While I haven't heard the others you mention (though I have heard good things about the Map1), I've been nothing but pleased with my Audio Refinement Pre-5. The closest thing I've ever had to a complaint with it has nothing to do with sound quality... it's the fact that it only has one set of 5.1 inputs. If 1)you have only a dvd player and aren't into SACD or DVD-A or 2)you use a universal player to cover those formats, like I do, then the Pre-5 may be just what you are looking for!