If you purchase a dual GTX 470 to run this game, you have too much money to know what to do with, and i hope you end up on 'till debt do us part'.
All this game will need to run at very high quality, smooth, is a card that by the end of the year wont cost more than $250 - the radeon 5850. Thats ALL you will need, maybe even less.
There is not enough justification for the average gamer to have a $1400 video card setup in their pc today. Games dont need it, in general its a waste of money and I point this out because making poor buying decisions like this only drives up the market prices on everyone else.
To give you an idea of how much extra you are spending, my 8800GTOC (with, gasp, only 512MB!) runs CODMW2 perfectly smooth on high quality, with help from a $110 amd quad-core cpu. That video card is about 3 years old now and the equivilent (9800GT) is around $90 to purchase today.
To summarize, you can get great value for your buck today if you actually try. Hardware is well ahead of what any efficiently-coded game actually needs to run well. So please, be a smart consumer, check things out first, dont assume you will Need to spend an arm and a leg for games like this.