I'm way overdue on posting this update, as I did this back in late September. But I owe
@Mather closure.
After spending a lot of time hemming and hawing over projectors, screens, and placement, I went with the BenQ HT2050A. Based on the angle and placement, I picked a 100" screen, motorized so I didn't have to pull it up and down every day, possibly yanking it out of the ceiling. Since the screen was in the corner, I was able to find studs to drill into, thankfully.
The projector is short-throw, so I have to prop its back feet to square the image on the screen, but it works great. Here's where the projector lives. Big plus with the new shelf; my records used to be on a low shelf beside/behind the couch and it was nigh-impossible to select a record on the lower shelf:
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And here's the corner where the screen is, before and after it drops. The bar from the screen is visible and not too obtrusive...just obtrusive enough to notice:
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I took this pic late afternoon from the other side of the kitchen counter while cooking; I conveniently picked a bright image, as dark colors/blacks don't show up great unless it's night and that light in the corner is out. It still looks quite good with ambient light:
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Thanks for all the input and abiding the hemming and hawing; two months into having basically a private theater I can say it's worked out quite all right.