I think you can consider getting a 2.1 soundbar. You mentioned the environment you have for the space is not ideal for good sound and you have a dedicated HT for movies. key factors: clear dialog, better than Tv bass, and wider soundstage.
My recommendations:
Samsung HW-N850/ZA (premium with Dolby Atmos audio)
Samsung HW-N650 (simpler with bass and clear dialog)
Sony HT-Z9F sounds pretty decent too and smaller footprint
Nakamichi plus 5.2 if bass is your thing. this system comes with dual subs and decently wide front soundstage.
My recommendations:
Samsung HW-N850/ZA (premium with Dolby Atmos audio)
Samsung HW-N650 (simpler with bass and clear dialog)
Sony HT-Z9F sounds pretty decent too and smaller footprint
Nakamichi plus 5.2 if bass is your thing. this system comes with dual subs and decently wide front soundstage.