need a new graphics card. current specs are an gtx 670, i7 3770k, 16gb ram, maximus v gene motherboard, silverstone 750w power supply. I want it to be able to play modern warfare on playable settings. play on a 60hz monitor at 1920 x 1080 ( considering upgrading very soon ) . new to PC gaming. Budget is around 300 - 400 AUD . Am aware I have posted on here before but more opinions would be very appreciated.