I would go for the Sourcepoint 8s.
I have owned dozens of speakers between the $3K and $12K price points, dozens… The Concept 50s were one of the most disappointing of them.
They were smooth and warm, but that’s where their strengths ended. The bass was very “one-note”, the imaging was just OK, and they homogenized everything played through them. And despite all the work they allegedly did to quell cabinet resonances, I could still detect a good bit of cabinet noise. Overall, an overhyped speaker. They had the looks and feel of $3K speakers but the sound quality of $1K speakers.
The Sourcepoint 8 probably isn’t perfect either (no speaker under $5K is) but based on measurements I would expect it to be considerably more neutral. Plus, no MTM speaker (mid-tweeter-mid) can match a good coaxial driver for imaging.