I agree with m0ney, get the 840 Pro model, go for the 850 models or find a good alternative.
After all, the top end are so close that you won't find any difference between them.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.