well ... no, in all the years i used a AMD GPU i had no driver complain unlike my current period with a Nvidia GPU (980) ahah! (latest AMD GPU was a 290 for me )
tho i would also recommend Nvidia in that instance except that i would recommend a 980 for 1440p, as i use DSR 1323p which is close to 1440p
don't settle for less than 4gb ... ok ... bad joke
tho i hope you don't plan to run a 1440p heavily moded full detail Skyrim on a 970
or a 390/390X since both are above (slightly) a 970 and no ... i will not "cost" you a lot on your yearly electricity bill if you go AMD (that's a "half" cliché, it will cost more but it's marginal )
edit: "LOLOL!" ... maybe you should stop DOTA after sleep and start LOL instead
(joking joking )