The PlayBar is great. It just connects to the TV via optical out and replaces your speakers, so should play all sources.
If you are looking to go full surround, be aware that not many TVs pass 5.1 sound through the optical port, you the PlayBar ends up just receiving stereo and having to upmix, so you either need a TV that passes 5.1, or an HDMI/optical switch. There’s info on this on the Sonos forums.
We started with a PlayBar, now have a Connect, 1 and 5. The 1 is the best bang for the cash and a pair would be great.
As above, Chromecast Audio looks very promising, if I expand to speakers I’ll do it this wayi think.