Go a 4gb 1050Ti, a 980 used or a 570 from AMD.
Right now 3gb are enough for 80% of the games.
But in gpu history you can see that the performance always was better with more vram in longterm. Best example are the gtx 770 from nvidia or how amd started the 3gb cards which run fine today still while nvidia cards have issue with frame drops due to full vram