Audiomike1, You do want to use the front LR outputs from an Oppo 105 whether for stereo or surround. You might want to by-pass the processing of the AV8801 for stereo, because the Oppo may have a superior analog section, but I don't know that. I suggest you visit the Oppo 105 owners' thread at AVS. An alternate connection from the Oppo to the Marantz would seem to be HDMI. I don't agree with much of what Avgoround writes, but I do agree that spending a lot of money on a processor seems misplaced.
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