the Oppo 83SE is what, almost 15 years old? Oppo made great products, but digital has advanced a lot since then. i would first add a newer DAC to the mix. there are plenty of reasonably priced DAC's that IMO would be better sounding than the DAC inside the Oppo. streamers have also come a long way in the last few years, but the sound quality depends on the quality of the input (qobuz or whomever). i have not done a lot of streaming, and haven't had the chance to compare what is out there, but i've heard that Qobuz high resolution sounds the best of the bunch. maybe others will chime in on this. i'm currently tempted to add the Ferrum Wandla DAC, which is currently $2,800 (not including the Hypsos power supply, which you can always add later).