Might be too late now, but in testing on hardwaresecrets.com it didn't pass the 100% load test at over 82%, it was at 81.5%, while the Antec EarthWatts Green 650W passed full load testing at over close to 84% at 45 deg C. The HCG is made by Seasonic while the EA Green is made by Delta (Saame OEM that built the older EarthWatts). One good idea is to look on newegg.ca at the user reviews and see how many are rated 1 and 2 eggs. Usually that is a good sign. I got the EA650 yesterday at canadacomputers.com, a killer deal at 60$. EA 650 W Green review here
Antec Earthwatts EA 650W green Review | KitGuru