I just mentioned that Corsair has unveiled a new computer case that is very nice for enthusiasts and gamers. The perfect add on for that case for powering your new rig would be one of the newly announced Corsair Professional Series Gold PSUs.
The line of PSUs is 80 Plus Gold Certified for efficiency. The PSUs promise 90% efficiency at 50% load when used with 115V AC input. Using the PSU with 230V AC power ups that to 92% efficiency. The new line offers 1200W, 850W, and 750W units.