When it comes to power supplies, the general rule of thumb is to buy as much as you can afford. To do anything less is opening yourself up for failure in the future. The Cooler Master Real Power Pro 1250 comes with more power than you will likely ever need. Of course, we old timers also thought we would never outgrow that 350 watt PSU we bought all those years ago too.
This product has a huge amount of power available and has enough overhead to grow with your system. While it doesn't come cheap, odds are very good that you will not be needing a replacement before the five year warranty expires. Online pricing for this monster at the time of this writing is in the realm of $320US, which is less than many comparable models but still a hefty price tag.
Performance is exceptional and as you would expect, this model comes with all the little initials and features you would expect to see from a quality power supply. It carries the 80+ power efficiency rating, is SLI certified and includes Active PFC. Add to this the long 5 year warranty and you have a sure winner on your hands. Additionally, while this model is rated at 1250 watts, this is a running power availability and can handle peaks of 1375 watts. Very nice indeed.