I would still get a good chain just for the sake of more refined design and tolerances (and of course the 10g or so weight saving!!!!!!!). I use both Dura Ace and YBN. The great thing is that your waxed chains will last a hilarious amount of time, so the small additional cost will be spread over a long time of use.
My main interest is extending chain longevity. Any extra watts or drivetrain efficiency is just an added bonus. After reading through this thread, it looks like I can wax without having to go through any complicated steps.