Ok, I don't think I can take any more reading after going back 33 pages...
It seems the consensus is that the Sony 'x'90 and Panasonic 'x'20 provide essentially the same PQ for both Blu-Ray playback and DVD upconversion, and that these models are the best choices in the below-Oppo price range, generally speaking.
The Sonys have better DLNA and support a larger number of file-types than the Pannys. The Pannys are quicker with loading discs and responding to the remote. Other than this, there is very little PQ or AQ difference between them. Vizio and Samsung are discouraged as unreliable (makes me worry about my new choice of a Samsung LCD), LG has little representation here, but a few people cast their vote for them, especially for steaming. (Apparently they also have reliability issues?)
I was about to go for a Panasonic, then I saw that mdavej and others who had been recommending the Pannys started shifting recs to the Sonys with the new models, mostly due to the more robust file-type support, if that was an important feature for a poster. So by then I was about settled on a Sony 590.
Then mdavej (IIRC) made the point that the Sonys don't playback FLAC, but the Pannys do.
So now I am in a bind, as I really like the video file support of the 590 over the 220, but I need to have FLAC playback, as all my music is in FLAC. But then again, I have a truck-load of various video file formats, .iso, .avi and .mkv containers and divx, xvid, h.264, mpeg-4, mpeg-2, VOB, VIDEO_TS folders, .wmv, .flv... .... ...
It really is all about choosing what you are willing to live without, since you're not going to get everything you want out of one player for a reasonable price. Perhaps a budget no-frills BD player along with a separate DLNA streamer that supports all my file-types would be the best compromise? I just don't want to give up PQ (esp. good DVD upscaling) by buying a lower-end model. Suggestions are appreciated! Thanks!