The Logitech Z906. There is a reason why many people use it for years and years and it was highly recommended in the audiophile forums. I use it for music, TV, games and movies. It has so much clarity in the highs, mids and lows that every sound sounds very natural and with the dedicated subwoofer that you can adjust the levels of the bass, you can suit it to how strong you want the bass to be and will even beat any HTS's physically huge bass with it's own small but very awesomely clear and not muffled bass.
Been using it for almost 5 years while others, even more than that. Plus, it is THX certified and can accept any forms of Dolby and DTS format including a direct Atmos input without any issue even though it is just a 5.1 surround system. Beating many $1-2K sound systems especially soundbars that tends to sound muffled in the highs or mids and not as surround feeling with them especially in the rear.
Price is only around $500 but you will use it for a long time. It is very durable too as my previous setup (using the not so trusty M3 tapes that cannot even hold my LED strips as well) used to drop my right speaker at waist level like more than 20 times till I give up. And yet, the speaker still works. It is that reliable as well.
PS: Atmos signal was when I play the sound from PC to TV and with TV's A/V sync set to Bypass instead of Off so as to allow no processing delay by the TV and with an optical cable straight to the speaker. (my HTS shows Atmos signal)
Else, my setup will be from the Creative X7 with the 4 dedicated audio ports straight to the Z906 since most of my output will be converted to 5.1 PCM thanks to MPC K-lite allowing for the Soundblaster X7 to clear up the audio even more for that added clarity.
Atmos signal is detected if I allow a bypass in the audio codec but with PCM, it is basically the same amount of channels sent. So no difference but will be useful for HTS that does not support DTS:X.