All it takes is 2-3 years for a low-quality PSU to suddenly start showing signs that it's not a good PSU.
What are you going to Crossfire?
Just be aware that the wattage rating of these kind of PSUs (probably including the Cooler Master) is only concerning its temporary peak capacity, not its continuous. This is one reason why it's important to get a quality, recommended PSU.
Another reason is the power delivery. Cheap PSUs deliver dirty and very unstable power (lots and lots of ripple). This can harm components in the long run. Quality, recommended PSUs deliver clean and stable power - and the PSUs themselves last for several years without any problems. Plus, they can handle all kinds of overclocking.
The PSU is the single-most important part of a computer system, especially when that system is being overclocked.
I'm not trying to say that CiT PSUs are all garbage, but I'm just generalizing.
Edited by TwoCables - 7/19/12 at 2:39pm