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Why are you so glad about it? You probably paid £385+ for a card that performs within 5% margin of HD6970 (presumably) and that costs £100 less. SO cash.
because i've had enough of my 5870's stuttering. ATI drivers just don't seem to be able to provide smooth gaming experience. that's compared to gtx 260 i've had before it.
because i'll be going nvidia this round anyway, might as well buy it. even if 6970 is within 5% of gtx580's benchmark performance, for gaming experience, i'll stick with nvidia for next couple of generations.
ATI cards have always been priced slightly less than similar performing nVidia cards. add to the fact that gtx 580 will be the very best single GPU card for a while, paying for the price premium is worth it. remember how buying 8800GTX on its release was worth every penny?
end of the day, buying the best single-GPU card will always cost more. you are paying for the trouble free and guaranteed performance. and im happy to spend more to get a single faster GPU then those supposedly good value crossfire/sli. (electricity bill for idle computer, heat, motherboard requirement and driver issues)