I see a lot of soundbars and some sound like garbage to my ears. Most will improve over the quarter sized speakers in most TVs today that don't even fact the listener. So when picking a soundbar you must set some priorities. Is better sound your main priority or surround sound?
For better sound you are much better with a pair of bookshelf, in wall or on wall speakers. Or a 2.0, or 3.0 bar speaker not designed to give surround sound. Add a sub if you want more bass. Here are some quality suggestions. There will be many others.
If good sound is your priority look at these suggestions.
Genelec 6010 in white or black. Very unobtusive has great sound and excellent off axis response. Can be mated with a subwoofer. No receiver needed if your TV has an audio ouput. and these have their own amps built in. Great for on stand, on a wall or in a bookshelf.
Episode Speakers has a variety in room, on wall and soundbars. The 300 snd 500 series can be black or white. A lot of placement flexibility here. They all do require a receiver or amplifier.
Triad speakers makes in wall, in room and sound bars. They all need a receiver or amplifier. Most of their sound bars and speakers can be custom sized to match your flat panel. And can be paint matched any color for no charge.
Atlantic Technology on wall speakers and sound bars are great choices. All need a receiver or amplifier.
Now some Surround bars for thos that want some simulated surround and not just better quality sound.
Yamaha has been one of the leaders in this field and they are highly tweakable to get a good response in your room. The auto set up doesn't always work the best but iff you manually tweak them you can get some surprising effects, These are all self powered and don't need a receiver. I'd only look at the YSP models, the other might provide improved sound but are bot great altogether,
Atlantic Technology FS-7.1 and newly announced HPAS model which should be out soon. The FS-7.1 works well in some rooms but needs a receiver or amplifier to make work. The HPAS is self powered.
The B&W panorama is another good surround sound bar and worth checking out.
Bose Soundbars also do a very good job and should be considered.
Now there are many other and frankly most of them are cheap and don't provide quality sound or surround effects. I've heard the Sony, JVC, Vizio, lower end Yamahas and none of those impress me. Sorry, I don't mean to insult any of you that own these. That are built to a price point and generaly improve the sound over the poor sound from TVs today. But by no means constiute quality sound.
I hope this helps and I'm sure I left out some quality brands in this post.