What a let down, no 20nm tech, not able to surpass the 780ti in gaming or benchmarks, oh but wait its 10 less watts of power!!! OMG 10 less watts of power!!! The 970 Uses 2% less wattage than the 770 SC ACX......hardly a reason to go out and buy another 28nm process......
Ok, here are some corrections for you and I hope it sinks in a little.
Let me first start by saying your rig with SLI'd 770s is very nice.
Now here we go, piece by piece.
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No 20nm tech" - Dissappointing but at the same time impressive to stay on 28nm and get this kind of performance per watt gain.
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not able to surpass the 780Ti in gaming or benchmarks" - 970 just about equals the 780Ti and 980 bests 780Ti by 5-20% depending on the game.
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oh but wait its 10 less watts of power!!! OMG 10 less watts of power!!!"
If by 10 watts of power you meant 85watts(980) or 105watts (970) from 780Ti, then you'd be a lot more accurate. No idea where you got 10watts from. I'm assuming you meant 780Ti because that is the last GPU you named before you said the above.
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The 970 Uses 2% less wattage than the 770 SC ACX......hardly a reason to go out and buy another 28nm process......"
Show us via a hyperlink where you are getting this information from please.
To answer the questions you are probably agonizing over....
You spent your money wisely because you got what you wanted and a kick butt gaming system. You wouldn't benefit from switching to a 970 or 980. 970/80 SLI might be a different story.
Finally, don't bash on 970/980 just because you aren't sure about your own purchase judgement on the 770s you have. You bought them, they are awesome GPUs. Be happy. Go game.