I probably have bored people to death about my upcoming computer build but lately I have been toying with the idea of getting a gtx 750 ti for gaming and add another gtx 750 non ti in the future for physx or getting a gtx 660 non ti, or even waiting for the gtx 960. so what would be my best course of action bearing in mind my psu has 1 6pin plug and i don't want to spend over 150 pounds on a gpu. Also i will build the machine around Christmas time.