If you're only running a single graphics card, stick with the EVGA G2 650W or the Leadex 650W. You don't need a 750W PSU, even when overclocking. I've got a G2 750W and it's overkill for what I need.
Of course, with the Leadex 750W cheaper than the G2 650W at the moment, it's a good buy if you don't mind the LEDs.