I went from a sub in the EP350 class (PSB 6i) to one more like the EP500 (SVS 20-39PC+) and there is a very significant difference when playing movies. For that room I would upgrade to EP500 before I upgraded to VP150, for example.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8