Help to choose video card and processor

My configuration:
Intel Pentium G630 @ 2.70 GHz 1155
GeForce GT 440 1gb
Gigabyte Technology Co. Ltd. H61M-D2-B3 (Socket 1155)
4gb ddr3.
Decided to upgrade my PC: CPU, graphics card and RAM.
The ability to upgrade a PC is on Craigslist because processors 1155 socket already where there is none, and then a stir of graphics cards in the stores now.
Selection of RAM only 1 - 8gb (2x4gb) from Kingston (3000 RUB).
Processors : i5 2500 (4 500 rubles) and i5 2500k (5 500 rubles). Also have i3 2120 (2 500 RUB).
Graphics card : gtx 670 2gb (8 000 rubles), gtx 1050 (8 500 rubles), r9 270x 2gb (6 500 rubles) and HD 7870 2 gb (6 500 rubles).
Please help to choose optimal build for gaming.