Read the thread about zidoo x6 android box, it looks promising. Would do all you require and costs about £65 or so.
Sony KDL-46HX853 and Sony STR-DN1050
MONITOR AUDIO BRONZE BX5 5.0 speaker package
SVS SB2000 Subwoofer
Nvidia shield TV running SPMC
Pi3 running LibreELEC
harmony touch remote control
26GB unRAID server