Speakers under $50k that rival $200k+ speakers?

Probably lots of speakers would fill the bill but one I'm sure of is a used pair of Rockport Cygnus.  

The only speakers on those price ranges I’ve heard were Wilsons. Not impressed.

That said if I had $50k speakers there’d be an investigation. Or $10k for that matter.

I’ll take the big Raidhos on looks alone. Wow! I don’t really care how someone thinks they sound. The sound is a function of a great many things. Almost any speaker can be made to sound great.

These were mentioned above, but the 2 models that always come to mind for me are:

Joseph Pearl 3

KEF Blade

A year or so ago, I was at Boulder Amplifier and heard their reference system (and room) built around Stella Grand Utopia's.  Easily a > $500k system, not counting the cost of the room.  They poured a separate foundation for the listening room, built the room, and then built the factory around it.  Delightful overkill :-)
Not that long thereafter at a Colorado Audio Society meeting, I heard a member's system that featured a set of Acoustic Zen Crescendo II's in a smallish room.  (His electronics were home-built).  I was struck at how similar the soundstage, dynamics and overall voicing was to the Grand Utopias.  They are $25K new and I recently saw a used pair advertised on Audiogon for ~$9k.  Didn't have the spare change lying about or I would have pounced without hesitation. 

I think they're a must audition in the price range you're talking about.