I also prefer Nvidia, have never had any issues with any of their cards, and the driver support is loads better than that from ATI
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The gtx590 is only slower because the 2 gtx580s are way more underclocked than the 6970s in the 6990. Stick 2 580s in sli and they will whip the 6970s
That is a given. Have a look here: (all i can see is pipe and smoking from ATI fanboys lol)
http://www.guru3d.com/article/vga-charts-spring-2011/3
Even there the 590 is faster than the 6990 in 2 important games BFBC2 and metro :)