I use an NEC NP-M352WS. I think its discontinued. 3500 lumen, 1200x800 SXGA. I figure the best you will get in the short throw field is around 3000-3500 lumens, 1280x800, before you go over $1k.
I have a good amount of experience with the Optoma short throw models too and put simply, they deliver. Should be fine for what you need and then some!