FrostedBlaze :
The 8GBS of vram is future proofing and the R9 390 does beat the 970 in most games. But again, 390 is my personal choice
That's funny, in every bench and test I've seen that is absolutely not the case. The 970 performs just as well and sometimes better than the 390, all the while using less power and generating less heat.
http://gpu.userbenchmark.com/Compare/Nvidia-GTX-970-vs-AMD-R9-390/2577vs3481
https://www.youtube.com/watch?v=udXCusTnRsY
I can post a TON of links that prove you wrong.
They are very close cards, and I will go as far as to say that the GTX 970 will do better in the future because Nvidia has a brighter future.
Now if I was to game on higher that 1440p resolutions I would definitely choose the 390 because of the higher Vram, but anything under 4k and those 8 gigs of Vram are kind of pointless really.