I have a similar situation. I have had the Oppo-83 for about two months, connected to my B&K Ref 50 S2 pre-pro via 5.1 analog. I use the analog connection exclusively for all disc modes - DVD, CD, SACD, DVD-A and BR. The Oppo decodes everything, including TruHD and DTS-MA. The Oppo sounds exceptional on BR TruHD and DTS-MA, and DVD 5.1. It is very good on CD, SACD and DVD-A. I use the HDMI only for video.
I plan to get the Oppo modded for three LCR analog channels. At that point, I will sell my current tube modded universal DVD player. For now, the Oppo can't match its CD, SACD performance.