The Seasonic "X" is one of the best PSUs you can buy. If money isn't a critical issue, get that one. If it is, get the Corsair TX650. If they have them, other valid choices would be Antec Truepower New, HCG, or Earthwatts models.
I wouldn't touch the Coolermaster. That particular unit is decent, but some of their others (in addition to being bad) have liar-labels on them, or are missing claimed protection circuits (fact, not opinion; reviews at HardwareSecrets). That's dishonest, and a dishonest company does not deserve anyone's business, for any of its products.