So, this is where we're at: We have the 2 new R2 295X2's ready to go, however the EVGA SuperNOVA 1300 G2 can only supply +12V@108.3A, we need +12V@112A (28A of current to each of the 8-pin auxiliary power connectors, 50A of combined current to the pair of 8-pin auxiliary power connectors) to power both cards, so rather than take a chance and end up blowing the power supply and potentially other hardware, we're going to grab a LEPA G1600 just to be safe, this will give us +12V@133A. We're also replacing all of the AF120's with SP120's this should provide better airflow due to the design of the front bezel (so I'm told).
*Update: (Oct 24, 2014): We have both R9 295X2's and the 1600w EVGA power supply now. Just need to find time to remove the old power supply and R9 295X2, relocated the H105 to the front, install both R9 295X2's, replace the stock fans on the Sapphire Rads, and install the new power supply. Should have pics of the completed project up by Halloween if all goes well :)
Ok, I'm installing the R9 295X2 x2 and the EVGA Supernova 1600w PSU this Saturday afternoon come hell or high water!