I'm gonna be building a new PC this Christmas, and had a few questions about upgrading. I have a GTX 760 and an i7-4790k. I'm planning on upgrading to a GTX 1070/1080 for sure, but i'm confused on the CPU and RAM. I currently have 8GB of DDR3 and would like another 8 to have 16. Should I stick with the 4790k, add another 8GB of DDR3, and get a 1080. Or should I upgrade my MOBO and CPU to support DDR4 and an i7-6700k, and get a 1070. For a build that I want to last for around 2-3 years, what would be better performance wise. (Sorry if you don't understand me, I suck at explaining things, If needed I can try to clear up a few things.)