edit: shame on me for not checking the cards listed until sunius replied. i'll agree that the specific 570 is too expensive. however since i am not overly confident with a 660ti, i'd suggest a 570 with 1280 Vram for $100 less.
Those two setups will be similar in graphics power, but single GTX 570 has more VRAM, and will not have issues associated with multi GPU systems. Furthermore, getting one powerful card means you will be able to upgrade in the future by adding another one, and by going SLI from the start you will not be able to do that.
That said, I recommend GTX 660 Ti. It's faster than GTX 570 and cheaper than the one you linked: