Which 5.1 ch Pre?

Bel Canto Pre 6 Gen 2, better than any of the options you mentioned IMHO unless you really want the tubes in the Copland.

Get a CAL Audio Labs SSP for under $1200.

QN

Anybody see the NuForce 5.1 pre at CES/THEShow this year, the door was locked when I got to it, was a different room than 2 channel stuff? Thanks, Mike.

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!