What is a good all around high quality speaker to purchase?

aigie88 & ihasaguy, FWIW, Maggies or other tall electrostatic or planar speakers might just fit the bill to overcome vertical dispersion issues the OP has due to a 6 1/2' ceiling. Problem is to maximize sonic response (3d imaging) these speakers really have to be 5+ ft from the wall behind them otherwise the back wave might just exacerbate the HF issue he has. The OP isn't wild about discussing room placement opportunities beyond his present placement of his B&W's. Yours is a good thought though.  Perhaps he just has esthetic issues with speakers out in the room more, or placement of his listening seat. Who knows.  It's his dime though. :-)

 I thought the 6 1/2 height was a typo for 8 1/2.  Evidently not.  It's nice to know that Gandalf brought the Shire some modern gear ;)

Another vote for Legacy Audio. I have the Signature SE's but, if I had your room size, I would have spent the (very little)  additional  money on the Focus. My Signatures aren't technically full range, but are close enough. And they allow plenty of detail and are not at all harsh (seems you have had issues with that before). 

Enjoy the journey. 

PS--I got the upgraded midbass driver. 

@onehorsepony 

I  currently have the same preamp and amps and went with Sonus Farber speakers. I would stay away from KEF or any other company with metal tweeters. I had KEF Reference 5’s and they hurt my ears even at lower levels. I tried a couple of other speakers with beryllium tweeters and had similar issues.  With the SF use soft dome tweeters and it’s made a world of difference for me. 
 

All the best.

so many speakers so little time https://speakerchoices.com/