About the link of the hierarchy of the GPU,well it was a list of CPUs
Oh shoot, too many hierarchy in bookmarks, got me confused. This is the right one, anyways you will have idea about CPU hierarchy also now Just kidding..
GT640 if you want to stay with nVid
7750 I think if you go AMD (was 7770, I was wrong)
don't know about R-series, so maybe that R7-250 is one but seems really lowly.
About the link of the hierarchy of the GPU,well it was a list of CPUs
Oh shoot, too many hierarchy in bookmarks, got me confused. This is the right one, anyways you will have idea about CPU hierarchy also now Just kidding..