While a soundbar can be convenient, it won't give the best sound, although it'll certainly be much better than the tiny speakers in a TV.
Speakers and the room have the biggest effect on the quality of what you hear. If you want quality sound, you should visit a local A/V store and listen to some speakers. In general, tiny speakers sound "tinny", so you want to get speakers with 5" or larger woofers. A separate subwoofer would greatly enhance the lowest frequencies. A popular rule of thumb is to spend about 2/3 of your budget on speakers, 1/3 on electronics.
A warning: Bose systems are *way* overpriced for what you get. Most of their price goes to pay for their advertising, not for the hardware.