I was also considering the HD25-LV, but now I'm also strongly the w1070 which is roughly $100 less.
From what I gather, both have around the same brightness levels, but the w1070 will have more accurate colors (I think it has something to do with having a better color wheel?) and less image noise, and the HD25-LV will have better blacks.
I'm also considering the w1080ST for it's flexibility. I have a dark basement room that I could set the projector up in, but it would also be nice if I could bring it up from time to time and set it on a coffee table somewhere when I don't feel like using it in the basement.
One minor thing I am concerned about is the 3D performance between the two. While 3D is not something I'm using at the moment, I would like the option of using it in the future. The Optoma supports both DLP Link and VESA 3D (RF), whereas the BenQ only supports DLP Link.
I know VESA 3D is newer, and I think technically better, but how noticeable is the difference in real world use? I've also read some complaints about DLP Link causing the image to look washed out, is this a real issue?