Well the 390 or 290 were my first choices before creating this thread, the problem about it was when Fury X and GTX 980 Ti launched I wanted to grab one of those for future proofing just because they can or will handle most new games at 1440p at max while 390 or 290 will handle a few modern fames at max at 1440p and then start to show its 'age'.I mean 390 at The Witcher 1440p maxed out without HW is at 35-50 FPS, for me thats bad.
And now that thing is what would make me jealous of seeing others get better frames with higher GPU's and then I would be afraid that I would replace it withing 5-9 months.
Concerning what you said that if I would get 980 Ti I would not get a real benefit from is something I highly agree with but this is where the DSR or VSR would be effective, if im getting too much FPS at a certain game >144 FPS I would turn on DSR or VSR at higher resolution and there I would be reaping benefits from both things.
Now I dont think my EVGA 650W Supernova G2 could handle 2 of 390's concerning high power draw.
And I agree with everything you said, the problem unfortunately is that I also was thinking about these things too, and that unfortunately cant decide what to do, I remember when 350$ was high end, this now is just ridiculous.
Also here is yet another few games I was thinking to play when they come out:
MGS V The Phantom Pain
Sword Coast Legends
Heroes of Might and Magic VII
Mafia III
Forgive me everyone for yet another long post and for being a pain in tge ass, but hopefully you can understand.