Get the more expensive one, it will give you the most for your money and it will last longer.
Edit: Also, you might want to consider switching the GTX 970 with an R9 390. The 390 has 8GB of VRAM compared to the 970's 3.5GB and it performs slightly better for around the same price.
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But the 390 will run crap on nvidia gameworks stuff
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That's why Gameworks crap can be turned off.