Save the $300 you'd spend on a conditioner and you're that much closer to the A1400!
I raised the same questions you did when considering the decision and ran into a lot of people like Jakewash saying they'd bought it and seen no huge results so I just ended up getting a good surge protector for about $50 from Costco. (though don't get me wrong, a good strong debate usually ensues whenever this question is asked!)
I am considering a power backup for my projector so that it has time to run the fan to cool it down in the event of a power failure, but outside of that I don't plan to spend any more money on power conditioners/surge protectors/etc.
