pranjal.3029
Colossus of Stars
I agree with you on the Haswell-E and Asus Rampage MoBo. Also all the DDR4 would be of "higher frequency" than DDR3 as DDR3 standards stop at 2133MHz and DDR4 starts from thereWith your budget and requirements, it would be best to wait for haswell extreme 8 core i7 5960x with Asus rampage 5 extreme and 32gb of quad channel high frequency DDR4 memory.
Coming to the gpus, to power two 60hz 4k displays,you would need 4 GTX 880Ti's(maxwell flagship) or 4xAMD 390X or whatever it would be named.
Powering this rig would need a hefty power supply.Corsair AX 1500i or EVGA Supernova 1600 T2 would be the best in this scenario.