Good PSU for 7770

I desperately need a new power supply for a card I was planning on getting. My specs are:

Dell Inspiron 560
Pentium Dual Core E5800
3GB DDR3 (or I could upgrade if there's space)
Radeon 7770 (XFX or Sapphire)
Stock MOBO (G45/43 chipset)
And I'm running 3-4 USB devices

I was thinking a Corsair CX500 or a Cooler Master eXtreme Power Plus 550W. Any suggestions?
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More about good 7770
  1. A 380W Antec Earthwatts will have no trouble with a HD7770. If you anticipate further future upgrades, you may want something stronger (like the CX500 or the 500W Earthwatts), but for that system, the EA-380D will be fine.
    Stay away from CM, especially the ancient "eXtreme Power [Plus]." They are mostly overrated near-junk, and may be missing claimed protection circuits.
  2. Good to know. Especially considering I have no experience in PSUs.
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