Hi Martin
I have a G91DAB and Hitachi 42" ALIS screen. Nick is right about progressive, as I juct can't seem to get progressive to work. However, 1080i from HDMI to DVI is fabulous. I also have a component feed, so can easily compare. The digital feed is miles better.
Do as Nick says try it out. It can take a bit of work to set it up but it's worth it.

Bob
Meridian G91D, 568.2mm, HDMAX 421 & 121, 5 x 557, Isotek Titan, Minisub, Hitachi 42" plasma and DIY Dynaudio speakers