What gpu is best for my Phenom ii x4 925 and msi 790 fx-gd70?

Im planning to buy a new gpu but I dont know what gpu is best for my rig because im worried that it will only bottleneck my rig ,the games I want to play are bf4,call of duty advance warfare,dying light, ryse son of rome and other new releaase games .here are my comp. specs.

MOBO: MSI 790 FX-GD70
PROCESSOR: PHENOM II X4 925 QUADCORE 2.8GHZ SOCKET AM3
RAM: RIP JAWS 8 GB
POWER SUPPLY:COUGAR 700 WATTS

I'm thinking to get a gtx 750 ti or gtx 960

what gpu is best for this specs ?any recommendations ?suggestions?
im also planing to buid an intel rig but not now bec I dont have a budget right now .I just want to buy a gpu while waiting.

my budget is 300 dollars