not a great cooler on these Armor versions. Great price though
Previous gen cards have always been sold off cheaper to clear stock. The 1080 was released in May / June 2016 and if you check the search engine on this site, 980Ti's were clearanced for about £350 between June and October of that year
A 1080 hit £380 yesterday if you used the 15% code yesterday.
Then you'll go without.lol
All of the cards you listed 1070 onward will give you max frames on high settings without breaking a sweat. I have a 970 and it plays most games on high settings well enough. The issue is, now is a good time to upgrade and the prices for a 1080 aren't that far away from a 1070 so may as well go the little bit extra. As soon as a 1080 his £400 ill bite, possibly around Christmas.