I do not really think you need to upgrade your system RAM to 16 gb anytime soon. 8gb RAM are still enough for gaming. On the other side, ram isn't that expansive but do not expect a big jump in performace from it.
Your CPU is fine (same as mine). I had no troubles with it till now and it seems to be fast enough for every game, even if the system recommended specs demand an I7. Also no need to OC it preemptively.
BUT you may consider to get an I7 somewhere down 2015. But it all depends how DX12 and 8 Thread operations are going to work out in the future. So keep it cool for now and relax your cpu is good atm.
It's hard to tell you wich gtx970 costum design to get. I bought a Gigabyte G1, because it seems to hold that 66°C even during it's boost frequenzy of ~1350mhz (arriving on monday, maybe on saturday with a bit ok luck). Other people are looking for a more quiet card like the MSI Gaming 4G or the Asus. Also the Palit Jetstream seems to be up there with the rest. And performance wise: The differences are very small so just get one that is not totaly overprized right now and you feel comfortable with.
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