I was thinking of maybe buying a new GTX 950 or GTX 960.
However there are some problems to deal with: 2 GB may not be enough for the near future.
Then this could create two new problems:
The GTX 950 seems to miss some shaders/processing units, so it might have a strange bottleneck like the GTX 970.
I also just saw another posting of somebody that the GTX 960 with 4 GB ram would have the same problem as the GTX 970, segmented ram at 3.5 GB.
I would be interested in seeing some benchmark performance test/charts with my testing tool here:
The newest version should be best for this purpose, currently version 0.16.
It would also be interesting to know if the test program worked or failed for some reason.