Well, Cooler Master makes units that are better than the $25 600 watt units, which aren't what any reasonable person would claim to provide 600 watts (they do, but for only a few seconds before shooting sparks).
The quality of a PSU depends on it's design, the quality of the components selected (particularly the capacitors and transformers), and the execution of it's manufacture.
Cooler Master falls into the region of adequate on these points, but that isn't going to gain much recommendation from enthusiasts who push limits while demanding longevity.
Antec, Corsair and Seasonic are among the favorites, though Corsair more for the company's customer support than specifically their design features. Seasonic makes a number of the other's units.
The power supply is one of those units upon which you may depend through multiple upgrades. They change as they age, especially the capacitors (which stabilize the electronic noise in the power it supplies). Cheaper capacitors age more rapidly, and units loaded beyond 80% of their design age faster than those loaded between 50 and 75%.
The best efficiency is usually found a little over the 50% load mark (as well as it's best noise figures).
As such, if budget allows, it's best to select a unit beyond your common load demand, but not so high that, at idle running, the unit is loaded below the 30% area (where noise usually increases again, efficiency drops again).
The 750 watt unit is a common theme, balanced among these choices, but your demands happen to be a little lower at the moment, and the 650's (or in that region) save some cash.
Some options (I have little experience with some of these, just quick selections).http://www.newegg.com/Product/Produc...82E16817371031http://www.newegg.com/Product/Produc...82E16817371015http://www.newegg.com/Product/Produc...82E16817151096http://www.newegg.com/Product/Produc...82E16817194049http://www.newegg.com/Product/Produc...82E16817371021http://www.newegg.com/Product/Produc...82E16817371026
>>the following Corsair is commonly recommended, but the previous Antec is actually a better choicehttp://www.newegg.com/Product/Produc...82E16817139006http://www.newegg.com/Product/Produc...82E16817371025