T-Bone, like ptsaras, I now have a W6000 as well. I loved the image quality on the W1200, but my unit had unwatchable motion lag with FI turned on (on some movies), and bands of distortion top and bottom with it turned off (all movies)! FYI, despite being built by BenQ, these two pjs seem to have very little in common. The W6000 is HUGE compared to the W1200... not a bad thing, just like comparing a BMW 5-series to a 1-series... if that makes sense.
Tried the Mits 4000; total letdown. Not NEARLY bright enough for my environment, but even with all the lights off at night, the image still seemed dull even compared to my old Mits 720p pj. LOVE Amazon's easy return policy!
Now I have the W6000 (actually got it from one of the vendors here instead of Amazon because they were willing to help me figure out what I needed AND price matched Amazon!) Love the W6000, but to my memory, it does not blow me away with clarity like the W1200 did. There was quite a bit of time between me seeing each one in action, so I've not seen them side-by-side. But the brightness and color on the W6000 is great! The mounting flexibility made installation fast and easy; totally silent unless INCHES from it. Though I can see RBE on other pjs, I have detected NONE on the W6000! Despite RBE, I still prefer DLP; not seeing it on my new DLP is HUGE WIN!! I have nothing bad to say about the IRIS technology, despite what some have reported; I think the total package is awesome for my setup. Played Goldeneye Demo on PS3 yesterday... zero lag, just awesomeness. Not a big gamer anymore, but I thought I would check it out.
Totally happy with my decision to go with the W6000 and glad to have stopped playing "musical projectors." The only drawback I can think of is the relative short bulb life compared to the others I've tried. But for me, the tradeoff is well worth it. Good luck!