We used Epson lasers on Night of the Living Dead. They were hires, really solid no complaints at all although fitting the superwide mirrored lenses was more of a faff than it is with the Panasonics.
On this show the three big walls were covered with 2x EB-L1715 (15k-SXGA) and 1x EB-L1755 (15k-WUXGA) - This range of Epsons are 3x LCD and are probably a bit bigger, more expensive and probably also noisier than you want for this job Mark, but we were really happy with them. I'd have no major concerns with them as a brand. The two screens overhead were our own old work horse Panasonic PT-D5700s, who's days are sadly numbered.
That said, I did work on an outdoor event a couple of years ago using Epsons to project on a building and we could not get the colour calibration to match in the projectors, the tell tail was how different they looked projecting onto the inside of the rain shutters in their temporary enclosure; when both projecting black there was one yellow/grey square on the shutter and one blue/grey. It was fine for that gig and we could adjust things a bit on the servers but I'd maybe want some kind of demonstration if I was in the kind of situation where you need precise, careful colour grading as it sounds, perhaps, you do. Those were obviously hires, out doors in a wet November, so it could have been many factors, but it's the only time I've ever had a problem with them.