Got my eyes on a pair of Amazon Echo Studio speakers. They can be paired with a Fire TV Cube (purchased over Black Friday) and should effectively work to replace the current sound bar + sub woofer. The added bonus being Dolby Atmos support for streaming.
The Fire TV cube is brilliant - adds IR capability which allows me to turn on the soundbar and TV with a "Alexa turn on the TV" voice command. Need to play around a little bit to get it to control the lights and a couple of other devices.