forget the gigabytes, i would not trust them to CF anything
the antec, corsair and seasonics would be what to look at. all four offer similar amps on the 12v, 29 -32 (antec is at the top). The two seasonics are bronze certified but the corsair (made by seasonic) and antec are only slightly less efficient. You can't go wrong with any of those. check to see they offer as many connections as you need for molex & sata as lower cost units tend to skimp on them.
if antec is at the top then should i go for antec430 over seasonic430?