The Corsair "CX" line was built by CWT using some inferior capacitors that don't like heat. If at all possible, I'd choose something a little better, like a 500W Antec Earthwatts, or something built by Seasonic. The 550W Rosewill Capstone is $75, or $85 for the modular version.
Edit: XFX PSUs are made by Seasonic, so that's a good choice.