Drivers? AMD drivers are better than nVidia's these days.
Beyond that, I still have issues with GeForce experience, and
I know I'm not alone with that.
My GTX 680 whines even in 'regular' games.
The power usage
money-wise is over-stated, since your computer will idle far more than it is running in full GPU mode.
I'm using Swedish numbers because they're so easy to look up. Only in marginal cases do they differ.
Using newegg, second lowest to second lowest, the GTX 980 costs 91.38% more than the R9 290X, meaning it's even worse. :P