hi josh , I got a gtx 1080 when it first came out 2 years ago , in a pc built by pc specialists the card alone cost £800 and I just looked at current prices and the zotac version I have has only dropped to £500. It can handle anything you throw at it but I am not sure if you could get a custom built pc with the 1080 for £1500 , mine rig cost 3k. I have seen lots of good reports on the gtx 1070.
Take a look at the build my pc section on pc specialist site , when you have done your proposed build it will check for component incompatability and say if your choice of power supply is too small or over kill.
if you want to see a mine review on my rig click here.