Agreed. GTX1050.
I looked up some videos to be sure from DigitalFoundry:
https://www.youtube.com/watch?v=CyYvoQPYPbs
It uses a GTX960, but you can swap that for a GTX1050 for most games:
https://www.techpowerup.com/reviews/MSI/GTX_1050_Gaming_X/27.html
In the Digitalfoundry video we see the GTX960 win or tie. I'm sure the R9-280 would tend to do better in more modern DX12/Vulkan titles (like DOOM) but not enough to justify a USED CARD.
I do agree the 2GB of VRAM isn't much of an issue. There's probably just a COUPLE games that could go over 2GB of VRAM at 1080p/1440p whilst tweaked to hit 60FPS or close, and if you got STUTTERS you should just experiment with the settings (like dropping anti-aliasing from 4xMSAA to 2xMSAA for example).
I had a GTX680 2GB until 2016 Q4 and the only game at reasonable settings that had issues that I noticed was Watch Dogs but that was a horribly optimized game anyway.
OTHER:
*To be clear, with at least 8GB system memory, and a half decent CPU you can play almost ANY game and have a good experience. Even Crysis looked great, and I ran it at 60FPS (90% of the time) using Adaptive VSYNC, 1920x1080, HIGH, 2xMSAA or similar settings.