I want to buy the best 1080 on the market but not sure which one to get

Kinda hard deciding whats the best one.
They can all clock the same on fair temperatures. You gotta be lucky on the silicon lottery tho.
The most overkill aircoolers is probably the Zotac AMP! Extreme, EVGA Classified and Gigabyte Xtreme

Any of these would be considered highend:
Asus Strix
https://www.amazon.com/ASUS-GeForce-STRIX-Graphics-STRIX-GTX1080-A8G-GAMING/dp/B01K5F8MJK/ref=sr_1_1?ie=UTF8&qid=1474043699&sr=8-1&keywords=asus+strix+1080

MSI Twin Frozr
https://www.amazon.com/MSI-GAMING-GeForce-GTX-1080/dp/B01GLYD7MG/ref=sr_1_1?s=electronics&ie=UTF8&qid=1474043712&sr=1-1&keywords=msi+1080

EVGA FTW
https://www.amazon.com/EVGA-GeForce-Support-Graphics-08G-P4-6183-KR/dp/B01GAI6478/ref=sr_1_4?s=electronics&ie=UTF8&qid=1474043789&sr=1-4&keywords=Evga+1080+ftw

Gigabyte G1
https://www.amazon.com/Gigabyte-GeForce-Premium-Pack-GV-N1080XTREME-8GD/dp/B01GJEE9BG/ref=sr_1_2?s=electronics&ie=UTF8&qid=1474043873&sr=1-2&keywords=gigabyte%2B1080&th=1

ROG strix

this