looking for a good graphics card for my build

Solution
^

Card:
PCPartPicker part list: https://ca.pcpartpicker.com/list/cXZBD8
Price breakdown by merchant: https://ca.pcpartpicker.com/list/cXZBD8/by_merchant/

Video Card: Gigabyte - GeForce GTX 1080 8GB G1 Gaming Video Card ($794.99 @ Newegg Canada)
Total: $794.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-04-11 22:16 EDT-0400
GTX 1080 or 1080Ti would be perfect.

As a side note, you definitely must choose different mother board. this wannabe MB can't power 8700K, the VRM on it is a joke. even if it will work initially, it will not last. and there is no way you can safely overclock on it.