I very much want to buy a projector pretty soon. I'm looking at the Sanyo Z4. Most websites that sell it also sell a 3 year lamp warranty which is said to replace two lamps should they fail prematurely. My question is, just how often do lamps fail way before they are supposed to? I've heard horror stories about lamps failing about 12 hours in and some at about 120-300 hours in. I know that lamps are supposed to last 2,000 hours, but how often do they fail before their time and do you guys think that the 3-year lamp warranty is worth getting?