GTX 670 or GTX 760?

Between the two, which one would you pick and why?

Whatever's cheaper. 670 is a little faster ( 10% maybe) at stock but the 760 may OC better with GPU boost 2.0.

It's a wash really.

670 is "faster" 760 will use a bit less power, will you go sli in the future? a 760 probably will be easier to find for a good price if/when you go sli.
is the 760ti out yet? 760ti IS the rebranded 670 http://www.techspot.com/news/54377-nvidia-geforce-gtx-760-ti-appears-as-rebranded-gtx-670.html

In my case I paid $280 total for two MSI GTX 670 OC Reference cards so that's the way I went.

The day after I got my 2nd 670 I happened to find two MSI reference GTX 680 cards locally at $200 a piece so I'm running those for the moment.

From what I've seen so far the 670 in SLI are what I'm going to be keeping in my build.

We are going to sell one 680 to help fund an upgrade from my brothers i5 760/MSI P55 to a 4670k/Z87 from Microcenter which he'll use with the remaining GTX680.

Win/Win for both of us.

I'd say you could keep your eyes out for a "lightly used(lol)" GTX 670 or even a 680 if you can find one.
The right models can still have a lot of warranty and life left on them.