Is OPPO losing it's way?

I use the 103D with a M51 DAC and it's a kilier combo.  It's worth noting that I use the stereo analog outs for casual listening, mostly to take advantage of the remote volume...the M51 has volume control but I love the OPPO app on my tablet.   It sounds pretty good,  no comparison to a serious DAC but that's why the 105 exists.  I was looking for a universal transport that could stream Netflix and Pandora and for $600 it was a no brainer......awesome machine for three money

I second oddiofyl.  The 103 is best with an external dac and makes a great streamer. If you like Pandora on the 103, give Tidal a try.  

What about inexpensive mods to an Oppo 93? Would a DAC like a Schitt Modi 2 help? Any other mods?

I don't know about the Oppo Sonica.  It uses a switching power supply and from my own experiments that is a big no-no in analog stages.  I have also tried iFi audiophile power adapters that uses noise cancelling technology and my $40 linear power supply decimated it.  I measured the noise on a Tektronix 150Mhz analog scope and the switching supply had more noise although both were quite low and I was getting to the limits of my scope.

I’m waiting for the future 4k replacement for the Oppo 105 as my next bluray player to replace my current 103. Hopefully it will be a well thought out, audiophile product. That will also be a good time to upgrade to the latest 4k full HD tv.