I've all but decided on the Benq PB6100, and need some advice. Should I go ahead and pick up a new bulb along w the projector, or wait until I need it? I was thinking that if I decide to return the proj for some reason the extra $300 bulb might not be returnable. However I've also heard horror stories about the bulbs in new projectors popping after a few hundred hours. Any advice would be much appreciated.