I had a BenQ W6000 with an Anamorphic Research lens. When they first came out, they didn't come with the chromatic aberration lens (mind you, they were a lot less expensive) so I bought it and I find it to be pretty fantastic. With the lens you get to keep all the brightness but get a larger scope screen. And you don't have to worry about black bars going beyond your screen borders like the AE4000 or the Mits if you don't buy the lens. I have no means of quantifying the loss of sharpness when using the A-lens, but I would say it is around 10-15%. That said, it is still amazingly sharp using a dlp projector and you get the benefit of having a bright screen without the loss of lumens due to zooming. You can get better lenses, but damn you will pay for it and, if you're like me, you will be perfectly happy with the AR lens.
Cool thing is, you can keep the lens and use it for other projectors. My Benq died and I bought an Optoma HD3300. It has an anamorphic mode which amazingly also works for 3D with my A-lens. Like you, I had no interest in 3D, either, but I figured I'd get a 3D projector anyway. Turns out, I find 3D to be so ridiculously awesome I anxiously wait for good 3D movies to come out on Blu-Ray. Watching Transformers 3 in scope on a 12' screen is nothing short of spectacular. So, don't toss out the idea of 3D if you haven't seen it on a DLP projector. Trust me, it's way, way better than the theater. Anyway, my 0.02. Happy pj hunting.