I am building a desktop and im going to have intel i7 4770k CPU. A ASUS Z87 motherboard. G.Skill Ripjaws X Series 16GB (2X8GB). An Western Digital Caviar Green 2TB 3.5" 5400RPM Internal Hard Drive. A EVGA GeForce GTX 780 3GB ACX Video Card. In the Case of a Thermaltake Overseer RX-I ATX Full Tower. Any suggestions on what PSU i should have?