After my 70" LCD set died and it was about to be picked it up "for salvage" by CC (under ext. warranty) they gave me a choice of either the Mits 73735 DLP or the Samsung HL67A750 LED DLP set, so I took the Samsung instead, figuring on an assumed longer life with fewer anticipated problems with LEDs vs. bulb and spinning wheel (I have 30 days to decide).
My seating distance with the 70" set was about 12 feet from the couch, but more like 13 when actually seating took place.
So before I got the smaller size Samsung, I pushed the whole HT setup forward a foot, making the distance about 11+ feet from the set, 12 feet distance eyeball to screen and it seems to work for HD programming to compensate for the smaller screen size.
-Now all I have to do is get a different TV stand as there are 6"+ gaps on both sides of the set instead of the more installed look that I had before with the 74" wide (side speakers on the set).
FYI, I have been watching the same HD channels and comparing the clarity, colours and other picture quality factors to our 60" SXRD in another part of the house and the Sony seems to be slightly better, so maybe I just will have to figure out what settings I will need to make it closer to the Sony SXRD.
EDIT: By using Dynamic mode, it just seems clearer, brighter and better colour now...standard mode looked washed out and my room has plenty of light, maybe that was it.