680 or 670 SLI for 2d surround

[greim]

Hi, i need help choosing a GPU.
I'm looking at a gpu for gaming on my 3 1080p monitors, i currently have a 6970 and I need something with a bit more power.
I've looked at the 680 and 670, if I'm going for the 680 i will likely buy another one later. If i go for the 670 i would buy two right away.
I live in norway so the prices might be abit different, the 680 is about 400GBP
and the 670 is 375GBP.

I know most of you will probably say to go for the 670's.
Could you please give a bit more detailed answer for why.

For the 670's i was looking at the Asus 670 DirectCU II
and for the 680 the Evga stock one.

As for the rest, i'm going to buy a MSI Mpower Z77 mb and an i5 3570k

Thanks in advance :lol:

 

[OcSurfer]

why not go down the 7970 route, more Vram for 3 screens, and i found them a lot better than my 670 for multi-screen, not to mention cheaper than the nvidia cards

 

[NRG!]

even 2 x 7950 will be better than 680 SLI.

if you must have nvidia then go for thr 670s.. (good case airflow required)