I was in the same boat late last year except I needed about a 10' screen with some ambient lighting. I first started off with the AAXA M2 micro projector - 110 Lumens. For $350 I thought it was a great deal and what really sold me was the onboard video player - 110 Lumens doesn't work in...
For the cost of the lamp maybe you'll want to just to upgrade... depends entirely on your budget of course! If you're tired of replacing lamps there's also that new Samsung LED projector. I think at 400 lumens it's usuable for most gaming / TV watching, although with movies you might want a...
That's a really hard question to answer, because like most electronics the technology is new and advances extremely fast. I think for the best valued I'd have to say the Samsung unit, but this is based on what I have seen at my local stores... Haven't really owned one yet...