Help! Which OS(Yosemite,El Capitan,Sierra) should you choose with this conf?

Hi,I'm a new member from Italy . Who know which OS (Yosemite,El Capitan,Sierra) i should choose? My configuration is:
MB = Gigabyte z170x Gaming 7
CPU = Intel Skylake i7 6700k
GPU = GigaByte 980Ti
RAM = Corsair LPX Vengeance 16GB
PSU = Corsair RM850i
CPU Cooler = Corsair H80i GT

Does somebody have the same configuration?
Where can i find all the drivers?

Please Help me
P.S. Sorry for my English!