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Optoma were definitely the recommended 'budget' brand when I was looking but you know how technology moves... For what it's worth, the bulb in mine is now saying it's run out but I haven't noticed a change in brightness (if the has been one) and that's been four years of heavy use.
For audio I'm not sure, we use HDMI into a receiver and wired speakers - you might get sync issues but I don't see why you couldn't airplay the audio directly from the laptop. I suspect most projectors with airplay would be for receiving rather than sending stuff.
Cheers, will look that one up. That sort of budget too...
Audio wise, send from the projector to my stereo via Airplay, although I guess if I play from a Laptop I wont actually need that....