I don't know the dimensions of the psu compartment in your case so I'll just post this as a reference. You could get this one here for cheaper with more watts. Now, it's not corsair, so it's not as "reliable" but power supplies aren't really the piece of hardware to cause problems first. This is just so you can cut a little cost and leave room for an upgrade in the future without having to buy another psu to do so later on.
Also, I'm not too familiar with AMD's FX series, but you might need to overclock a little to help it keep up with that 3GB 780, which is just ridiculous.