Just to say that I once did a comparison of DVD upscaling on my Oppo BDP 93 against my old JVC HD350 projector and finally my Lumagen Mini3D video processor (the later two options using the HDMI 1 output and 'source direct' mode in the Oppo). In reverse order I felt it was JVC > Oppo > Lumagen. However they have different 'styles' of upscaling: The Oppo is a bit like my old DVDO Edge in that it superficially looks sharper (especially on a smaller TV screen) but in fact it's because of the ringing. The JVC just looked a bit softer, but the Lumagen looked best of all due to the unmolested source direct output of the Oppo and the 'no ring' upscaling of the Lumagen.I only have PAL DVDs which are 576/50i if it makes any difference.
I have a 112" wide scope screen and have to say that my better DVDs (a couple of 'superbit' ones) look surprisingly good on this setup. Viewed on my 40" TV from the same 11' distance then it's hard to tell that it isn't HD (more a comment on the viewing distance and small TV). On the projector so long as you haven't just watched a BluRay, then DVDs are enjoyable, but just obviously not as sharp as BluRay. In other words, even with a pretty top notch setup there is only so much you can do with a lower resolution source, so in some ways it's just splitting hairs when the bigger picture is that just using a higher resolution source (if available) gives a much more significant improvement.
"Don't believe everything you read on the internet". William Shakespeare 1615