My old monitor (27" 60Hz) died and I need to upgrade, which is making me consider upgrading my GPU also, but I don't want to overdo it and bottleneck my CPU. My specs are i5-3570k, GTX 660Ti GPU, ASUS p8z77-v motherboard, 16GB 1600 RAM, 750w psu. For gaming I mainly play online MMORPGs like...