Speakers known for great midrange.

Tekton, LOL that's mid price stuff at best and they're ugly as sin.

"I hear the Harbeth quality control can be hit or miss."

And where did you hear that from? Do tell!

Sorry.  If great midrange is your priority, you need panels/electrostatics.

Could put them on stands I suppose.

Budget is 5000.00. 
 

QC issues example: 

I had a pair of older Spendor 2/3s that were wonderful for the midrange with tubes. Contrary to what folks say I thought they rocked well with rock music as well. Not to mention the great deal I got on them with stands included. I think buying used with speakers is the way to go, provided you trust the seller’s packing ability. Bought the Spendors and my EgglestonWorks floorstanders from A’gon.