If we're talking about a 7970 GHZ edition, then it will be faster than the GTX 680, otherwise the Nvidia card will be the better performer.
That is if we don't factor in overclocking.
When overclocked, the 7970 is leaps ahead of the 680.
Or why not go with hd 7950 vapour x 3gb at rs 21k as you will save 13k!if hd 7950 overcloked then it will even beat gtx 680.hd 7950 just kises the hd 7970 in performance.spending 11k extra for hd 7970 is not worthwile.
I like to go with lightning (cheaper from your link, custom pcb, looks nice inside the case with the extra light ..)
but it seems had some issue with dual link 120hz monitor in multi (3) monitor setup...