I found a lot of GTX 1080s for 300$ and even some for 250$ but I don't know which one to save up for. Here are my options:
Msi GTX 1080 Gaming 8GB X - 300$
Gainward GeForce GTX 1080 8GB Founders Edition - 300$
Zotac GTX 1080 AMP! Extreme - 300$
Gigabyte GTX 1080 G1 Gaming - 300$
Asus GeForce GTX 1080 Turbo (I think) - 300$
GeForce GTX 1080 OC 8GB - 300$
Msi GTX 1080 Gaming 8GB X - 300$
Gainward GeForce GTX 1080 8GB Founders Edition - 300$
Zotac GTX 1080 AMP! Extreme - 300$
Gigabyte GTX 1080 G1 Gaming - 300$
Asus GeForce GTX 1080 Turbo (I think) - 300$
GeForce GTX 1080 OC 8GB - 300$