marantz sr5015

I'm having a touch of upgrade-itis. I have a Marantz SR5015 in a 3.1 configuration, Paradigm Premier 700F fronts, 500C center, and a very old Outlaw LFM-1 Compact 10" down firing subwoofer. My tiny bit of research indicates the DAC in the SR5015 isn't all that great. Also, I'm kind of tired of...