I've tested $3,000 soundbars. I've tested $67 soundbars. And I've tested pretty much every level in between. At some point, the price-vs-performance ratio must plateau, right? Yes, kind of. Once you're looking at more than around $2,000, I'd forget a soundbar and get either floor-standers, built-ins, or buy each piece individually. You'd probably get a better overall sound.
But if you want an all-in-one, JBL's finally got the answer for you: the JBL Bar 1300XMK2. I tested the original last year and loved it, so I was incredibly relieved when the upgraded version blew me away, too.