While we are talking about Sony projectors...
There is a dealer here in New Orleans that has the HS51 and the Qualia in the same demo room. I saw them both in a brief demo and in the understatement of the year, the Qualia was better - by far. It is far brighter than the HS51 and even withstood a fair amount of light in the room when I asked the dealer to turn up the lighting.
However I will say that the HS51 was a pretty decent performer in a direct "true" comparison to what arguably is the best projector on the market today under identical near ideal viewing conditions. I however recently took the plunge on a another Sony unit that I do not believe has been discussed here previously and likely won't be since there is a snobbery toward 4:3 LCD units here, but I will still toss it out for you guys to dismiss.
Sony had a relatively new model projector that is tiny (12"x9"x2.5"), weighs six pounds and is rated at 2500 lumens. The model number is VPL-CX75. I allow a fair amount of ambient light in my viewing area (by design) and the high output of this unit works exceedingly well on my 11' Stewart 1.3 screen. In fact I have to run the Sony unit in econo mode which makes it practically silent and brings the lumens down to 2000 and the lamp life up to 3000 hours. Sony states that this unit uses the same cooling scheme as the Qualia. The case is gray-white in color and the Sony ceiling mount bracket is white. With the quiet fans (there are actually two small fans) and white color scheme I have a bright wall of 11 foot 4:3 standard video output and 10 foot 16:9 HiDef video output that seems to come from nowhere.
Other features of this projector irrelevant to home theater but are neat and worth mentioning are its ability to handle WiFi wireless input from PC's only (Sorry no Mac drivers) and it can read CF and Sony Memory stick cards. It has electronic zoom/focus and even motor driven front legs. The lens has a cover over it that opens and closes when the unit is powered on and off. It has an instant off and unplug feature. When you are finished your viewing you can quite literally turn it off and unplug it immediately from the wall. The fans keep on running for a couple of minutes to finish the bulb cool down while the unit is unplugged. And all of this comes from a quiet projector that is no larger than the average yellow page city class phone book.
Like the typical bright LCD unit it has the screen door effect but that can easily be toned down with a bit of defocussing which is a technique I also saw used by the dealer here selling the HS51 and Qualia units. The blacks are "blacker" on the HS51 compared to my CX75 but I love huge theater class output. I had a 6 foot Sony forward projector for more than twenty years and the 6' to 8' screens typically used with the nominal 1000 lumen DLP units touted here are to me not much more than the big ugly monolithic rear projection units.
I continue to contend that while this knowledgeable but possibly too lenient group puts up with 1000 lumen units that require near totally dark rooms and are willing to pay ten to twenty thousand bucks for the top models we will not see that true HiDef video wall in our home theaters most of us secretly dream of having. Other than the Qualia which is huge in size and currently way too costly there is not really much new coming out except the forthcoming LCOS Canon unit which preliminarily appears to have flaws but much promise.
Unfortunately many here are making their livings selling what is available now so they accept what is currently out there. I contend that we could possibly force faster progress in true home theater 16:9 units if we told our suppliers we want brighter and better than what they are offering us now. How do we do that? By not buying their overpriced under lumen'ed models and find ways to utilize the cheaper business class units where you get far more bang for the buck. Vote no for low (lumens) with your dollars!
I'll live with my not quite so dark blacks and buy a new, better business class unit every year or two and still be way ahead financially and screen size wise than folks that adore their phenomenally dark blacks on "huge" seven foot screens.