All: I was able to demo the HD131xe last night. Without a doubt, it's very nice for the price at $720, but to me it was a pretty easy decision to stick with the W1070. Blacks *might* have been slightly better on the HD131xe, but the image had weirder coloring and a much "grittier" picture, versus the filmy feel of the W1070. I played with noise reduction settings on the Optoma but didn't get the results I was looking for. On the plus side, it is also quiet, but not quieter in my opinion. ( I did not use an SPL meter) The remote and menus are not nearly as nice on the Optoma.
To go back to the idea of this thread's intent, if you have a 3800 now, I wouldn't recommend the Optoma unless you really need 3D and it's all you can afford (hard to imagine anyone is really in this camp); but I can recommend the W1070 if it's in your price range, especially if you can sell your 3800 for a fair price (about $500, I'd guess), and you're interested in the features, like more light output and longer lamp life, or just want to get "in warranty" again.