Would like suggestions for a reliable, high-quality PSU that can support 2 GTX 780's in SLI with headroom to spare. 800W isn't a hard limit, but it's my take on how much I might need (I do have a lot of fans, USB devices, and hard drives in my system). I have no overclockable CPU, just a basic locked i5. Prefer to keep the budget below ~$120 (but again, a little more or a little less is okay).