greedy

Hello, I currently have intel i5 3570k msi z77a-g45 2x4gb ddr3 1600 520W alim little ssd et big hdd radeon hd7850 I would like to play new greedy games (in 1080p), do you have any recommendation of which component(s) to change ? ps: i plan to buy second hand component budget: 150$ thank you