12K new/used to spend

I am thinking of upgrading my speakers and can go up to 12K, new or used but less expensive is definitely appreciated. I need fairly high WAF plus some that would sound great placed less than 3 feet from the back wall and would prefer under 48" high. I listen to a variety of music accenting rock and classical/orchestral. My front end is NorthStar CD&DAC,Aragon 8008BB amp and 28K preamp. I have a large room. (see system for more detail)
I am thinking Wilson Sophia2 or B&W D series or Sonus Faber.
Any suggestions would be appreciated as to speakers I should consider and what you like about them. Also if used, is there a limit in years used when you need to be careful about degradation from drivers and crossovers. Thanks, Joe