Sounds like you are looking for musical fidelity the OPPO just isn't built from transport to power supply to DAC (as implemented) and output stage of providing. Sensible mods to my OPPO 105 did help but didn't quite do it. HUGE (all capitals intended) upgrade in musicality and functionality occurred when I added a bel canto DAC2.7 followed by the vastly better DAC3.7 with VBS3. Still use OPPO for DVDs and streaming with the audio out to the DAC3.7 which is doubling nicely as preamp for the OPPO, the cable box, a bel canto cd-2 (for superior cd playback fidelity over using the OPPO as CD transport) and phono preamp. Wishing you the best current and longer term results for your spend.
SACD/CD player update
i have invested on analog for a long time. From vinyl to Reel to Reel, VPI turn table to tube preamp. But sometime i looked at my shelf, there are still over hundreds of SACD and red book CD over there. also some Hi-def in my hard drive. I only have an Oppo 105 to play them. I wonder if it worth to invest on a better player. Thinking about Esoteric, but i never do A-B comparison and don't know how much i can gain. I'd like to hear some advice. Thank you.