Sort of a toss up between the M12D based XFX 750W unit, and the X series seasonic units(X-750 and AX750 from corsair). Performance/output quality wise, the XFX 750W is probably the best currently available unit. However, the X-750 and AX750 are only slightly worse when it comes to output quality, but are 80PLUS Gold certified for effeciency.