Im currently using this cover. It works great for me and it feels sturdy. https://www.amazon.com/gp/aw/d/B01LW53TG4/ref=mp_s_a_1_13?ie=UTF8&qid=1482510641&sr=8-13&pi=AC_SX236_SY340_QL65&keywords=honor+8+dwaybox
I also have the Spigen one linked above me, but my headphones wouldn't fit with that cover. It really is a nice cover that I recommend, unless your headphones have a fat 3,5mm connector.
I stikl havent found a screen protector to get. Maybe someone else has a recommendation?