There are many decent phones from tier 3 manufacturers. I have my eye on the Mlais MX base which has been as cheap as $680. Most interesting feature is a 4300 mah battery.
Currently using an Elephone P6000 which is totally fine. Cost about $750 and came pre-rooted with stock Android 5.0. Dual sim, 2gb ram, 4g, good battery, meh camera.
I'm not really sure if tier 3 is the right way to call brands like Mlais and Elephone, but I do know there are even more obscure ones that I would personally avoid.