And the 950 is ~10$ cheaper.
AMD only makes sense if you're looking for a price/performance build. A 1055t can be had for 178$ and has ~85% of the 1090T's performance.
PSU: You would probably be fine with just a good 650 watt, but there's a good deal on the XFX black edition 750 watt units right now. Since this is a render build, it will likely be maxed a lot so the efficiency of the XFX might make sense.