So Corsair just released an update to the lower-power CX series and boy howdy are they looking awesome:
http://www.jonnyguru.com/forums/showthread.php?t=13055Here's a quick rundown of what's changed:
5 year vs 3 year warranty
Full power at 40°C vs 30°C
2 vs 1 PCI-e connectors for the 450W version
4 vs 2 PCI-e connectors for the 650W version
DC-DC voltage regulation vs group regulation, meaning the new units are fully compatible with the power saving features that got introduced with Haswell
There are no reviews out yet (they're not even listed on Corsair's website yet), but it's only a matter of time.