Add to that, the InFocus's strengths, a slightly sharper image, and over double the brightness in best mode. The two produce about the same brightness in brightest mode, but the InFocus definitely has the better color accuracy and picture quality in bright mode. The InFocus, despite its Darkchip4, still can't quite match the blackest blacks of the Epson, but isn't far off.
Epson has a slight advantage in warranty (with the Home version), two years like the InFocus, but with an overnight replacement program for both years, while the Pro version is the same, but three years. Two excellent projectors at different price points, but overall, the brightness and sharpness of the InFocus will have many finding it to be their preferred choice, despite that it is roughly double the price.
After that, though, the IN83 shines - it's roughly 50% more lumens in best mode, compared to the RS1x, and double the lumens of the RS2, is a huge plus for many, especially those with large screens (over 110 inch diagonal), and it is easily double the lumens of the JVC's in brightnest mode, which really is a plus for those that watch with some ambient light - especially HDTV, SD-TV and sports in general.
The RS2 may still be the best of the best in picture quality, overall, but those lumens, and extra sharpness are major strengths of the InFocus IN83, that will please all but the most hard core black levels fanatics. Of course the RS1x is less expensive, while the JVC DLA-RS2 is roughly the same price as the InFocus IN83.