If you go with the black widow screen, learn from my mistake and spray it on. Unless you are a pro, it will more than likely fail and you will end up with ungodly vertical roll lines that you will easily notice in bright scenes (eg. sky). I was super meticulous and used Floetrol and everything (you couldn't notice the roll lines until you fired up the PJ). The one thing I liked about the screen is the contrast was kept pretty well even in ambient light. If you have a completely light controlled room, you don't need it IMHO and would be best off going with a neutral grey with polycrylic for added gain.
Easiest is to mount your projector, get a blue screen image square with the wall and to the size you want, then use painter's tape just outside the image. Cover the area quite well and spray with a hvlp sprayer diluted around 15-20%. Then get flat baseboard molding wrapped in velvet and frame it in right to the wall. I used nails and "No More Nails" for mine. Yeah, that's going to be a bitch to remove, but I'm not planning on moving, so...
For the money you've saved, get the Optoma HD33. You can get a really good deal right now from a place that rhymes with postco and they will provide their own extended warranty if I'm not mistaken. There, I've done all the work for you. You're welcome.
Video: Optoma HD3300, Panamorph UH480, Darbee Darblet, Samsung BD D6700 Blu Ray player, DIY Seymour Centerstage XD 138" Curved Screen
LCR - Tannoy DC12i, Sides - Tannoy IW63, Rears - Tannoy Saturn DC6ti Bookshelf, Ceilings - Tannoy CMS 603DC (TF), Tannoy CMS 601DC (TR), 3 Micro Marty/1 Full Marty DIY subs
Amplification: Emotiva XPA-3, Emotiva XPA-2, Outlaw Audio 7700, 2x Inuke 6000DSP
Receiver: Anthem MRX 720