I am not getting the results I wanted from the Oppo 105 as pre/amp with my old McCormack DNA-HT5 amp. I remembered Jim loving this Marantz, but forgot it was a pre/pro and not a receiver with amp. Has anyone tried the AV Receiver versions from Marantz? SR7007, SR6007, SR5007 or NR1403? I only need 5.1 (3.1 really) and it doesn't have to have massive power. Any thoughts on these or other options?