I'm in the process of buying components for my first real build. I'm pretty sold on tri-fire 6970's. I will be running an eyefinity set up on 3 1080 monitors. The rest of the system will consist of a p8z68 deluxe, i5 2500k, 1 ssd, 1 hdd, 1 optical drive, noctua dh14, and the case fans on the raven rv02-e, which i believe is 3x 180mm and 1x 120mm (?). I was originally planning on just doing dual 6970's and using a corsair hx850 (or ax850). Will the same PSU handle the third 6970, or should I bump it up to 1000w? If that's the case, I will consider spending the few extra bucks and getting a 1200w for future-proofing sake. Thoughts?