What Gpu Is Compatible With My Pc

[Step2797]

Hey Guys and Girls Maybe So Im Looking For a Gpu That Is Compatible With My Cpu and Mother Board and Psu If That Matters
Cpu:intel i7 4770
Motherboard:Gigabyte H81M-S2PV
Psu:500 Watts

I Wanna Be Able To Run Arma 3 On High Setting and The Sims 4 On High Settings Without Lag
I Don't Want To Spend Like 500 Pound On a Gpu I Don't Mind Spending Up To 100 Pound If Need To Please Help!!!

 

[Quikxx]

I think a GTX 660, or a GTX 750ti or the AMD equivalent of them should be alright, preferably with 2gb's of VRAM