Corsair HX750 will do ya just fine... I dunno what the nonsense is about them only having 4 pin power connectors. All their midrange to high end models are designed with SLI / Crossfire in mind.
[insert self-promotion here-->] In fact, you could buy mine for any offer of $100+ over on ebay!
It's like new, it's modular, it's a higher quality PSU than the OCZ models above, and it has the required 6+2 pin PCI-e power connectors to power 560ti SLI.