Seasonic Platinum Series 1200 W @ techPowerUp
 

Seasonic recently added a new high-end model to their arsenal, a 1200 W unit with Platinum efficiency, extraordinary performance, semi-passive operation, and a fully modular cabling design. This PSU is one of the best we ever tested and teaches manufacturers a lesson in how to push analog circuits to their limits.

http://www.techpowerup.com/reviews/Seasonic/P1200/