Just purchased a Stewart ST-130 G-3, 108" diag. Luxus Deluxe screen, 1:78. I have it coupled with a new JVC RS-25 PJ.
This is heresy to many AVS'ers, but I went with this over a Hi-Power screen, primarily because I paid a bit more for my JVC RS-25 to get "ultimate black levels" and I felt that the Hi-Power, while it is awesomely smooth and bright whites, it "neutralized" the ADVANTAGE that my RS-25 was purchased for. Having said that, my wall samples showed out that neutral samples of 1.0-1.1'ish gain were a little blacker still than my (true) 1.3 gain...which BTW, samples proved out that the Carada BW is NOT 1.3 as advertised but as AVS folks have long noted, more neutral...just about 1.0-1.1.
This whole experience of trials/samples/looking at screens with material on it reveals that there IS NO IDEAL SCREEN, but for my room of black ceiling and front wall, burgundy flat paint walls and dark carpeting, the ST-130 was a "best choice" for me. The 1.3 gives me a little extra brightness and yet reasonable black levels...yea, I'd like the blacks a negative or neutral screen gives, but even my "OK, whatever" wife noted that many other screens gave dingy brights (say, depicting a beach scene).
I got a good price from Jason Turk here on AVS. Stewart costs more, but I see no grain or sparklies...which bugged me about the Silverstar (unacceptable). So, in final analysis, I'm a happy camper.