you mean 970? 980 is too overpriced, you will never roi
Get a rig with perhaps 2 or 3 970s in it, if it has the space.
Reminds me of the R9 280x and the 290x. The 290x had the better hashpower,but was hotter and more expensive, so was better to have 2 980x's than 290s
I think for X algos and others, not scrypt, the 970 could be the new R9 280x here.
Interesting article anyway.