Well, buying the 1080ti would represent a 60/70% of my monthly earnings, I'm from Argentina I work as software developer, but as I still live with my parentw until late this year I can enjoy it while it last and throw all my money at random stuff haha.
I like the FE, I currently have a 780ti FE which OC's to 1170mhz. It's loud but when you put your headphones to play, you can't hear it.
Regarding about buying a 1080ti and sit with it for a few years. I didn't changed my 780ti because I didn't need it. I was playing Battlefield 1 almost everything on ultra 1080p sitting in 60fps. Now that I switched to a greater resolution and refresh rate I need to change my GPU.
I'm gonna hold it a while and wait a month and see how the prices seat.
The performance gain from oc is like 15%, so and AIB card would be good to squish that performance. FE can't OC that far without having liftoff of the case.
Vega is out of the conversation because my monitor has G-Sync, which is smooth as . Probably if I switch cards, I would cap the FPS to 143 to keep that G-Sync