You think the 770 will have issues with the game? It's only the slightest bit below the 780 that the have for the recommended specs. I can't imagine it's going to suffer much at all if you're running around 1080p.
I have a 770 as well and never once felt like it was going to hold me back with Fallout 4.
Yes, 1080p for me. I hope we'll be ok, obviously going to have to make some sacrifices. You know, the only game I've been able to play at max with my 770 is Battlefield 4. Ah well, such is life.