Any of them will work fine. The Epson is a touch brighter and has a little bit better contrast, but it is a refurb. If the warranty is good on the refurb then I wouldn't mind the Epson (I have an Epson and I love it). The only thing that the Benq has over the Epson is vertical lens shift. Lens shift is the ability to shift the image up, down, left, or right without moving the projector or distorting the image. That model Epson doesn't have any, the Benq has vertical and the Optima doesn't have any. Lens shift is definitely nice if you can afford a projector with it. I can tell you it made my life 100 times easier not having to prop the projector up and movie it around and around trying to find the sweet spot for it.