You dont need a 1070 for 1080p.
The main reasons for the price diffrence are the above and maybe smaller factors but reliabilty is a diffrent matter as i have had gpu,s from budget and high end manufacutrers.
None have brocken.
I understand.. I'm thinking about future proofing.
If I got the 1070 now i have the options still then of upgrading the monitor at any point without the GPU.
There shouldn't be any issues with my CPU & motherboard with the 1070 should there..?