Get the Maxwell, it will do the job much better than the 1070 for rendering, I cannot emphasize this enough.
@konius, it is more dependent on the quantity of CUDA cores available to work with rather than speed and gaming performance, that does not translate directly into rendering.
@OP, the Ryzen 1700 will be a great fit.
What's your budget in Euros?
I'll make a list for you.