If you have enough money for it, SeaSonic's Platinum PSUs are probably the best to get.
But trying to stay in the $80ish range,
SeaSonic M12II 620W Bronze
Rosewill Hive Series 650W Bronze (I wouldn't normally recommend Rosewill but my brother has this PSU which is ran for the most part 24/7 for about 3 years, no problems)
Corsair CX600M 600W Bronze
I still need a new case XP