Yeah, this threesome really is the "showdown" of reasonably priced 3D-capable projectors this year. Pluses and minuses for each of them:
Epson 5010:
- least expensive
- brightest 2D (both in "calibrated" and "max output" modes)
- brightest 3D, but the dynamic iris doesn't function in 3D mode, so you don't get the same high contrast or inky blacks in 3D.
- manual only for lens shift, zoom, focus
- noisiest of the bunch, though still quiet
Panasonic AE7000:
- the real "middle ground" in pretty much everything
- middle in terms of price
- least bright when perfectly calibrated, but middle brightness in "max output"
- dynamic iris functions in 3D as well as 2D
- the least black blacks, though still plenty deep
- powered lens shift, zoom and focus plus 3 pre-sets for memorizing aspect ratio settings (combination of zoom, lens shift and focus for different screen sizes)
- quietest of the bunch, even in high lamp mode
JVC RS45/X30:
- best contrast, no dynamic iris
- most expensive of the group
- middle in terms of calibrated brightness. Least bright in "max output".
- Kinda dim in 3D
- powered lens shift, zoom and focus.
- middle in terms of noise
It's a tough choice! If your room is pitch black, there's no doubt that the JVC has the most impressive looking image with its super high contrast, super deep black levels and just that "wow" image from having super deep black and bright white at the same time! But it's no "light cannon". It really isn't well suited for overcoming ambient light.
The Epson and Panny are very similar to each other, as you would expect given that they use the exact same LCD panels. The panny has the nice motorized controls, but costs more for it. As is typical, the Epson is the brightest, but if you watch 3D, it's a shame that the dynamic iris doesn't function in 3D mode.
So long as your room is going to be "light out" whenever you watch, the JVC is the best looking of the group. But if there are ever going to be times when you have some ambient light, I'd strongly consider the Panasonic. While you have to take it out of perfect calibration, it is capable of being a "light cannon" and it honestly doesn't lose a crazy amount of color accuracy. It loses some, but it's still entirely watchable when you crank up the light output. Personally, I like the Panny's 3D performance the best as well. You can up the brightness without losing too much color accuracy. You get to keep the dynamic iris functioning. And with the Panny glasses, you get 3 settings that trade off cross-talk for brightness, you can pick your own taste