Your in between speaker becomes your endgame speaker if you can't find anything that's better in all respects. Got Eminent Technology ET8's in the last century and now they're upgraded to the Super 8 (added backward firing woofers).
So happy to see open baffle speakers mentioned. There's no box like no box. Even on YouTube, you can hear the difference when you get rid of the box. Planars like ET8 or Maggies are naturally included.
OP: could you post the rest of your system in the Systems portion of Audiogon?