I'd have to agree with okcnaline, When I had my 780ti's, they still did really well, in fact, they often scored between the 1070 and 1080, but the I often had issues where my 780ti's VRAM was holding me back from turning stuff up at just 1080p. PlayerUnknown's Battlegrounds will use up to 7GB of VRAM, on ultra at 1080p on my 1070, I couldn't even run it on medium setting on my 780ti's due to running out of VRAM.
I'd honestly get yourself a GTX 1050ti 4GB or a GTX1060 6GB to last you a while.
But what is you're budget, the 1050TI is around $150 bucks. The 1060 6Gb is about $200 - 250.