Thinking $1500 or so should do it
Whoa there. $1500 for 4K playback?
Strictly, all you really -need- for comprehensive 4K capabilities (even Netflix 4K) is an Athlon 200GE. Use one myself, handles everything thrown at it so far. On the Intel side, even a basic (Core-based) Celeron with UHD6xx graphics will do fine. Through you might want something a bit stronger for Windows updates and the like.
A 2200G is a fine compromise between CPU and IGP capabilities.
Everything beyond is simply icing on the cake...