theater system recommendations

Budget?

Arc Ultra, 2xEra 300’s at rear, plus 2xSubs. 

Budget option, Beam, Era-100s and maybe a mini-sub. Won't blow you away but it will do a good 5.1 and limited Atmos presentation.

I find my Beam struggling in a 15x15 Room, good enough TV sound but movies lack impact. One in a 10x10 room does much better, One SL surrounds, also a mini-sub would be nice, my full sub is very underutilized there.