your 7970 ghz isn't really "old". i have a 280x and am relying on dx12 to carry me through till pascal/arctic islands comes out next year.
was looking forward to the fury myself but hbm didn't seem to pan out as well as predicted.
personally, a 980ti seems to be the only enthusiast card worth getting this generation.
as far as the nano is concerned, i still think it's an interesting card 'if' it can outpace hawaii at a much lower tdp as claimed.