We had an older model at my church and the bulb lasted many hours, until it was broke in transit...cost a few hundred to replace as well..;-)
Not sure what things are like these days..;-)
Also some of the ones they use at the school can only be on for about an hour before they overheat and automatically shut-down, all of which could be prevented with some cooling I'm sure, but still..;-)
Don't pay less than $800-1000 dollars (US) for (a new) one; anything cheaper is crap. And beware of used bargains: lamps are expensive, and the more you use them, the faster they burn out. Projector LCDs don't last forever, either. Now, you could get an old 3-gun CRT projector, but they're a bear to calibrate and are really big. OK for watching the game in the local bar, but not good for FS, I'd say.
Get a great big CRT or LCD monitor instead if you've got that kind of dough... you'll be happier. If you get a nice projector, you then need a nice surface to project onto. Ordinary white paint is OK, but not ideal. It'd be like spreading caviar on white bread. Plus, you need a dark room, etc., etc... unless you're setting up a total simpit with some kind of rear-projection setup (expensive screen!!!), it's prob'ly not worth it.
I know all this because I install all kinds of projectors and other high-end AV stuff for a living. Normally don't deal with the smaller consumer jobs, but from what I know about "desktop" models, you can rely on what I said in my first sentence...
If you're still interested, I'd recommend NEC, Sanyo, or Christie, as far as mfrs. go.