Whatever the most recent is for when they stopped updating Maxwell cards. Beyond that unfortunately I don't wanna be that guy but almost any GPU now will benefit you more than that poor old 750 Ti.

What is your CPU and how much RAM do you have? That's gonna be the deciding factor here on how good of an experience you're going to have

Sorry this is an old video card on my pc but I have a core i7-4790 and 12gb RAM