OCZ is not a highly-trusted brand for power supplies. Look for a Corsair, Seasonic, or XFX psu instead.
If you plan to overclock, you'll need a 3rd party cpu cooler. If not, you can save a little money by switching to an i5-3470 and an H77 or B75 motherboard.
16GB is excessive for a gaming rig. You won't see a significant benefit over 8GB.