I am considering getting either the 3 channel version or the 5 channel version. Has anyone had the opportunity to compare the new model against the old to see if their is a significant improvement? I would like the amp to able to drive at least one pair of 4ohm nominal speakers with a minimum of 3 ohms over the frequency spectrum. Will the Anthem be acceptable or should I look at the Acurus A200, Sherbourne or Parasound. Also heat is a consideration, so I would like it to not run on the warm side if I can help it. Also, how important is damping factor and slew rate. I know the Anthem specs are considerably less in this area than some of the competing amps. Thanks.