I would take Corsair TX550m, it is rated at 80 Plus Bronze where as the Antec is only rated at 80 Plus, so in theory the corsair would be better at saving the earth and money if that is a concern.
Well the box on the Antec most definitly says 80 plus bronze as well. it is the Earthwatts EA-650 and says up to 88% efficiency. it seems if there was a bigger ceiling on my system it could actually achieve those numbers and be mroe efficient then the Corsair. in theory atleast