On the HT-PC I have found 1920x1080 to be the best resolution, and on the PSM-1 (cinematrix) 1200P.
When using a Quadscan I choose 1024x768 this gives the most crisp picture, when selecting the D-ILA resolution the picture turns to soft. Probarbly an issue of the Quadscan. Can see lines on 1024x768, but most vieuwing is LD and TV (so that's only 10%).
Greetings from Holland,
Frank