Might as well, Ivy Bridge is only 2 months away
Edited:
Also, regarding what you said about SLI 460's, I would assume they would perform better than a single 560 Ti 448, but don't take my word for it as I have no clue what they can handle
Two 1GB 460s in SLI should outperform a 560 Ti 448.
Edited:
i5 is more gaming oriented, i7 is for people who do lots of rendering and graphic work. Power calculators are shit, they'll tell you to buy a 700W for a single 6970. Ivy Bridge is staying on 1155, but with IB-e it could potentially change to a newer socket type. The best price/performance card out right now is either the 6850 or 6870, but 560 Ti performs much better in BF3 (anywhere from 5-10 fps increase over 6870 depending on resolution and other stuff)
Ivy Bridge-E will be LGA 2011, just like Sandy Bridge-E.