If the Sony was used for in-store demos, maybe check how much usage is on the lamp (total rating is only around 2000-3000 hours; lamps are expensive).
If the usage is low and you don't need extra brightness (ie, nice dark, light-controlled room), then yeah: I'd say Sony as well.
If they stock both projectors, it might also make sense to demo them both before making a final decision.
BenQ W1070 Projector; Xtreamer Ultra 2 (running XBMC on OpenELEC) via Sony STR-DH540 AVR with Boston Acoustics SoundWare XS SE 5.1 Audio. MediaBrowser3 for Mobile Streaming.
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