Benq w6000 is only 1 year warranty. If it was 3 years I would say go for it, but I didn't know about rainbow effect on it.
How about this as an IDEA. We all went to movie theaters as kids and even as adults. Now in these movie theaters they had PJ's. If we judged those PJ's and screens the exact same way we judge our AT HOME personal PJ, wouldn't they suck, Big TIME. Terrible blacks, and lines on screen in front, terrible sound. But we really didn't notice, once the movie started , we settled in and GOT INTO THE MOVIE. If I'm on a small hdtv or big one or PJ, once I'm immersed in MOVIE, I'm not focused on the blacks or anything else.
Same with computer monitor, we had terrible screens a number of years ago, but if it got the job done, we didn't care, UNTIL people started talking, judging, making us fault find and nit pit, until we get out of the immersion to examine the place we are seeing it in.
Now movie theaters have gone through changes , 3D, IMAX, ect, to help in the IMMERSION process. And to sell higher price tickets.
So when you first start watching something, it might take a minute to settle in, but once Immersed, unless the PJ really sucks, there are NO BLACKS and everything looks really burry, or hazy or not sharp at all, or you can't hear what people are saying, you are gonna be fine. Now if you or other people in ROOM are sensitive to Rainbow Effect, they could develop a headache or weird over-whelming feeling. it could be even be subconscious thing, and they could make the PJ watching a "special" event. If you are not bothered, you would watch stuff on it a lot. Again, I think many people could be bothered by this effect and after an hour or 2 , decide they want to watch stuff on regular hdtv or device as change. Something to throw into the equation in deciding what to buy. I think 1080p is a good feature because you are blowing the image up many times and are not sitting 40 feet away from screen but closer, so high def is nice, I have seen low def on home PJ's and it's just not that sharp looking.
So for me, when I bought last dec, 650 for pro8200 seemed like good deal. Also, in 3 years after my 3 year warranty expires I could buy a NEWER PJ or when the bulb pops after 6,000 hours on bulb, replace the bulb.
p.s. The Benq w6000 coderguy recommends does seem like great unit. So I guess weigh the pro's and con's and look at reviews and user reivews and check their forum room. You have to live in area where Fry's is located , sold out online. 1,100 dollars, maybe you could get a square trades extended warranty for 3 or more years just to protect yourself, hate to have 1,100 dollar device go south after 1 year. Also, check how much bulb replacement costs, and how many hours users are reporting on it before it POPS. And if any known problems. I don't know, myself.