I've always seen Antec recommended as a quality PSU brand, and typically see Corsair touted as the best.
On Newegg the Antec 650W has 80% rated 4 or higher. A comparable 650W PSU from Corsair has 84% 4 or higher. I would say that based on the sample size that they have similar failure or DOA rates. As a note, for the Antec PSU I saw a few duplicate 1 star reviews and a review that rated it poorly because it wasn't modular and didn't come with a power cable. With such a small sample size if the Corsair PSU doesn't have similar frivolous reviews the satisfaction rate is about the same.
Personally I wouldn't worry about it if that is the PSU you want to get.