If you need card right now and no money for TITAN X only right option for you will be GTX980 SC, GTX980 Classified.
I would advice you GTX980 SC reference design but much better Classified model.
You will not see any improvements with GTX970...
Buying another 780 is bad option too because limited memory.
Example Dying Light is one nice game but need more video memory than 3GB.
Except that 780-780Ti cards are good for gaming.
It's stupid to install SLI and only because memory to drop texture on medium in more and more games...
From 780 to 980 you will have more fps improvements than 780 to 780Ti. That's nice upgrade.
First colder card and more space for OC, low power consumption I will not count because that's less important thing, but 1GB more video memory is exactly what few games demand for max settings and difference in GPU is about 30% because 780 is not full chip and 980 is even stronger than 780Ti. You can sell your card and invest in 980, best option.
post edited by Vlada011 - 2015/05/27 01:59:00