Tarkan :
Any ideas rough safe starting point would be niceand with this psu would it be safe to buy a motherboard I could overclock with and overclock both cpu and psu
I used to overclock my system... I have since stopped and started to buy more powerful parts. With a 970, you can get another 970 and SLI with great results. If you can afford it, that would be my suggestion as that would give you the most power.
If you want to overclock, go into the nvidia control panel and start upping the clock speed slowly. Keep an eye on the temps and check performance.