I am in a small room and thus listen at lower volumes in the nearfield . I have found quite good success with Reference 3 a Di Capo i's , a standmount speaker . I am assuming that you will retain your tube amps , as these speakers really like tubes . Depending on the size of your room , you would be able to move up the line as per your budget constraints .
Now , given that , I have been on a search for a speaker that would give me the stat/panel sound in a small room . The closest that I have found is the new Beryllium tweeter technology .
I have heard the JM Lab version in the Micro Utopia Be which is a standmount . They also offer other versions including the Diva Utopia Be which is a floor stander designed for small rooms . The Micro is in your budget but I am not sure about the Diva . I am talking about new prices as these don't come up used too often .
A less expensive alternative is the new Be Ushers in the Dancer series . They are also using the Beryllium technology in their tweeters and I have heard that they are now offering a speaker with a midrange Beryllium driver as well . Caveat , I have not heard these yet as they are pretty new . The Usher Dancer line comes in at about half price as compared to the JM Labs Utopia .
Good luck and please keep me posted on what you find .