Hello CSA,
Cooler Master make pretty decent power supply units and I'm sure if you were to buy one, it will be fine. However, I would just like to point out that some of the Cooler Master units +12Volt rail ampage (Which is essentially what you need to look for when looking to purchase a new power supply since the +12Volt rail provides power to the more power hungry components in a system such as the graphics processing unit, processor and the hard drives) aren't as powerful as, for example, an equivalent Corsair power supply unit.
Take the
Coolermaster Real Power 620w Modular Power Supply as an example - It is able to supply 43 amps on the +12Volt rail. Now, take the
Corsair HX 620W ATX2.2 Modular SLI Compliant PSU which is able to supply 50 amps on the +12Volt rail which is considerably more.
Though, admittedly the Corsair unit above is slightly more expensive than that of the Cooler Master unit.... Just something to take into consideration maybe.