Good thing SOW is Nvidia's friendly !

When figuring in the cost of a card vs. another card and then adding to the SLI/Crossfire you should take into account the increased power consumption. GPU's these days are not like the Voodoo3's and 64mb Geforce 4's of late 90's early 00's. They are big, and they eat a lot of electricity. Might not be a factor for people who have an apartment or are living at their parent's house, but that adds up over the year, especially if you're one of those gamers who spends a few hours a night gaming and not just having your cards sitting idle while surfing the net.

I'd love to see some kWh usage per month/year for some of those cards. Given the heat they produce they might rival your average TV or small appliance.