Thank you for the input. I'm upgrading from a 3-year old single 9800GTX+. Although a single 460 GTX will be a fairly good upgrade, I feel as though it's not enough. Furthermore, my budget is around the $300-$400 for video cards, so from my understanding is that a SLI setup has more bang for the buck.
Therefore instead of going with a single 560 Ti (my original choice), I'm opting to go for the 460 GTX SLI option (also recommended by the latest video card review article).
So now that I know the 460s overpower the 550s, is there an even better option for the money?