recommended graphics card for pc gaming

Hello all,

Just before xmas last year i built my own PC with the following kit:-

Intel Core i5 3550 3.3GHz
Gigabyte GA-Z77-D3H
Crucial 16GB (4x4GB) DDR3 1600Mhz Ballistix Sport Memory Kit
LiteOn iHAS124 24x DVD±RW DL & RAM SATA Optical Drive
Western Digital WD1001FALS 1TB Hard Drive SATAII 7200rpm 32MB Cache
CoolerMaster 120mm Sickleflow Fan
Coolermaster Elite Power 500W PSU
Coolermaster Elite 430 All Black Interior Mid Tower Case with Side Window
TP-Link PCI Network Adapter

I mostly use this for internet browsing, downloading and playing Football Manager and SimCity 5. However i'm thinking of giving the next console (Xbox one / PS4) a miss and getting a graphics card for this pc and then switch to PC gaming instead.

So i'm after some advise / recommendations on what graphics card to go with. Can anyone advise?

Thanks,

Darren