If you are going to watch in the dark and 2D is a priority then go with the JVC. The JVC is better in best mode for 2D. If you are going to use ambient light or 3D is priority the Epson's brighter modes make it a better choice.
I would go with the JVC, but the Epson will be better on the bulb-life side....I own a JVC RS20 and if you love Sci-fi space, you can't beat the blacks on the JVC. BobL above is pretty correct. I've owned both epson and JVC just to let you know.....
I totally agree with you fellows on the JVC. The image quality is superb! The price of admission is just a bit much for the quality. My unit is down for the second time in less than 3 months. I enjoy it very much, but if I had to do it again. I'd go with a more reliable projector. The Epson can't quite match it in the contrast/black area. But every where else it should do just as well if not better.
If I could get the JVC's contrast with the Benq's lamp life, I would be in heaven! 6000 hours has got to be terrific..if the lamp can last that long.
I'm setting up my first Theater experience in about a month, I too am stuck on what Projector to get (budget $3000), I think I narrowed my options down to these 2 as-well. Problem is I would actually probably prefer the 5010, but I'm a gamer and the lag issue's worry me.
As a gamer I'd look at the Mitsubishi 4000 if it fits your room. Both the JVC and Epson have a fair amount of lag time. If you don't care about 3D look for an 8700/9700 but the Mits is still better for lag.