I just looked up the prices for GTX 1080, and there has been a price rise on Amazon. About a month ago the 1080 was average just under £500, and I was getting interested vaguely. Now they are all about £550, which is too much.
The 1080 Ti is looking the better option, but waaayy expensive. (£550 for 1080, and £670 for a Gigabyte 1080 Ti, makes the 1080 ti look the better deal.)
I really want to go 1440p monitor though, in the future. My 980 is going to struggle at that resolution. I either need to upgrade graphics card, or go G-sync to smooth out demanding games that will push my 980.