Yeah, soundbars are nice but if you really want immersive they are hit-or-miss. Sometimes my old YSP could really throw surround but mostly it couldn't.
But for 1200 clams you could get a Playbar, and 2 Play1 for rears. That would be fairly immersive and no wires. Or, instead of the Play1s, you could get the Sonos Sub. Depends on how much boom you want Personally, boom is really hard to make sound good without a lot of work so I'd go Play1s.
There's a guy on the Sonos thread going through that decision process.