I am primarily a two channel audio guy. But my partner is into movies.
We have what is probably the best sound bar (Sennheiser) in the bedroom with her 65” tv (she is disabled and more or less lives in there) and in our living room a 77” tv and a high end surround system… which we built incrementally over ten years… so we have had less expensive surround stuff.
There is a huge difference between a surround system with discrete speakers and a sound bar. The sound is instantly more involving. We go into the living room and watch movies together on the weekend.
In the end the quality of the sound is not quite as important as a music only system, because you are a bit distracted by the video… but quality really matters.
You can see my system under my ID. We have stand mounted speakers. With an open concept you will have to decide if you want to put some speakers in the wall / ceiling or just do basic 5.2.
I would stick with brands like NAD and Rotel as they are built to sound good not just have lots of functions. But in choosing every aspect all the principles of choosing audio apply. Separates are better, a big multichannel amp is much better… two subs better than one. Better speakers are better speakers.
When the depth charges go off in U-571 the whole house shakes. But even a modest system will sound enormously better than a sound bar.
I guess one way to look at it is our Sennheiser sound bar currently cost about $2.5K a $2.5K surround system would sound much… much better..