A quality 600W power supply should be plenty, 550W is fine if using a typical Intel CPU.
You should stick with tier 1 or 2 from the following list if you can, the CX600M is tier 3. http://www.tomshardware.com/forum/id-1804779/power-supp...
Some better suggestions:
Any XFX 650W power supply, e.g. XFX TS 650 or XFX Pro 650
Rosewill Capstone 650
Antec HCG 620