If you're not in a hurry, I'd be tempted to wait until there are more projectors with LED or other alternate light sources instead of filtered 'white' light. If time is of the essence, buy 'cheap' but usable current technology with the idea that this won't be used long term but instead replaced about the time the lamp reaches the end of its usefulness with either a projector that has a long-lasting RGB light source or such an item as a light curtain viewscreen.