Hey man, I know you are trying to be helpful and that is cool. However in this thread and a few others you've displayed a near total lack of knowledge about the actual power requirements for video cards and systems in general. I don't know where you learned these things from but I can assure you they are incorrect. I suggest reading some video card reviews. They almost always have a section devoted to power usage so you'll be able to see what the reality is. This is also a handy tool if you are curious about the approximate power usage of a specific collection of parts;
http://extreme.outervision.com/psucalculatorlite.jsp
For example I just put in the system I suggested above with a GTX 580 in place of the suggest HD6970, a sound card, 2 PCI cards, 2 USB devices, 20% capacitor aging, ect and it came up with 620-660w with every component at 90% power draw(something that will never even come close to happening in real life.) The PSU I suggest has 62 amps on the +12v rail or 744w. It can very easily handle this system and suggesting otherwise or telling them they need a PSU that costs a few hundred dollars to run mid-range video cards isn't helpful to anyone.
As for the price of the HD6970 it is already on sale in Europe and is selling for less than the GTX 570.