It looks like the 8gb GTX580 is still the best choice for mid budget gamers as you could still get away with just 8gb of vram. This is not the case for 4gb cards and possibly not the 6 GB GTX 1060.
The higher end nVidia cards really demand alot of system ram. I know that the extra $200 to go from 16 GB to 32 GB is pocket change for someone getting a $1300 gpu, but for those spending around $700 for the gpu, that $200 is significant.
That 8s why the GTX 1080ti would be a much better buy than the GTX 2080 as the extra 3 GB of vram may make a difference for those running 'only' 16 GB of system ram.
The higher end nVidia cards really demand alot of system ram. I know that the extra $200 to go from 16 GB to 32 GB is pocket change for someone getting a $1300 gpu, but for those spending around $700 for the gpu, that $200 is significant.
That 8s why the GTX 1080ti would be a much better buy than the GTX 2080 as the extra 3 GB of vram may make a difference for those running 'only' 16 GB of system ram.