... I don’t have an Oppo yet but I was thinking of a modified Oppo BDP-105D.
I would like to know more about the sound quality of Sooloos with the ID41 card. Is it better than the Oppo BDP-105D as a streamer?
No - I have not used modded Oppo 105 but I can tell you I replaced 105 with 103 and continue to use its digitial into HD621/861v8 with analog set up. Sooloos was convenient for me.
From time to time I have read that a Marantz processor is almost as good as a 861v8. Hmm, if this really is true, than I will have to reconsider everything.
I owned 8802 and replaced with 7702. For HT (I have mentioned earlier) having front height (or even ceiling) speakers make a big difference with latest formats. Lot more enveloping IMHO.
For 5.2/7.2 sonically 861v8 was much better IMHO-otherwise I would have sold it. I am sure others would differ

so let your ears decide.
Regards,
Kishore