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Another thing to consider is if you plan on getting a ultra HD display in the near future. I think the HD7950 will do better on higher resolution because of larger memory interface.
If you can afford a 4K monitor in the near feature you should probably be getting 2-3 of the top of the line cards. That's 8 million pixels to render. 3x1080p eyefinity is only 6 million.
Also with a modded bios (volt mod) the 670 can also over clock pretty well.
1 or 2 HD7950s would probably work great with a 21:9 2560x1080 gaming display.
The problem for higher resolution for the GTX 670 will be the smaller memory interface.