Some people say having massive PSU is a waste but its completely dependant on your system build.
This is one of those reasons why i have a Corsair AX1500i
Granted my system is still a socket LGA 1150 using a i7-4790k cooled by a H100i, but its also got 32GB (4x8GB) DDR3 memory, 4 hard drives and two Sapphire R9 295x2's
When I originally used the PSU calculator it recommend minimum of 1300w so in my case 1500w was perfect.
Expensive yes, but does whats needed.