Upgrading by step ¿What should i buy first?

prac daske

Honorable
Mar 11, 2016
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The first i'll change is the GPU my options are: GTX 1060, GTX 1070 and recently im considering the RX480. Then i'll get a i5 6600K (still dont know wich MoBo) and ddr4 Rams. Finally, a new case.
I know there'll be a huge bottleneck specially with the 1070 but ill get the intel cpu anyways.
The thing is i cant decide between these 3 cards now the prices are getting lower and re-live is out. I've watched a bunch of videos and benchmarks and still dont know wich one to use. Same thing for the Motherboard..

Could you help me to decide how to build my new rig?
Many thanks in advance!

...and sorry for my english...