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driver game optimization tends to be on the latest gpu released only and not on older gpu series.
As a SLI with those could beat the GTX 980 in some cases. They can outperform a GTX 780 Ti, and the GTX 970 is a GTX 780 replacement card (using half the power for slightly better performance).
Note: That SLI is limited to the graphic card memory of a single card (apps/games dump duplicated data into all of them to work, it's not shared memory). So if it's 3GB, you will still be 3GB in SLI. Minimum is 2GB, recommended is 4GB for 64 bit, under Nvidia Surround (3 monitor setups).
They will also get the DirectX12 support later on too, for an addiitonal freebee boost.
Also consider noise levels and heat, depending on your case size and PSU usage. Also some games tend to have bad scaling in SLI.
GTX 970 on the other hand leaves you more future proofing...
You get more modern card with 4 Gb VRAM and all the new features for future games.
performance-wise gtx 770 is better than a single gtx 970.
economically, no.
SLI gtx 770 vs single gtx 970/980
Certainly worth getting GTX 970 then, SLI wont add VRAM, you will still have only 2 Gb to use.