I'm in Europe. The DD/RR reset is at 1 AM here. I'm usually doing my best to stay up til that hour, but I can't do that always. Not only that, the owner of the room I'm currently in has a problem with me staying that late due to her having to leave at 5-6 AM and not getting enough sleep because, you know, computer and a desk lamp generates light that kinda doesn't let her do that. Either way, I'm pretty sure there are more people from Europe who'd love to feel the thrill of discovering the next daily on the usual hours. So how about moving the time of DD/RR reset back by 1 hour every 2 weeks/month/whatever period you find suitable? If it's possible and if it's not a problem to let others fully enjoy the pleasure of discovering the Daily Deal themselves.
I really prefer having a fixed reset time, but I don't particularly care when. Midnight UTC makes sense as a standard because it's the base timezone, and is easiest for most people to convert to their local time.