the LS5 is another top contender although it is all balanced inputs (you can use cheater plugs there) and can be had for a bit less - they come up on audiogon from time to time. I'd put it right up there with the Ref 2 (in a blind demo it was neck and neck)
You might also want to consider a Great Northern Sounds upgrade on your existing LS25 or an LS5 or Ref 2
You might also want to consider a Great Northern Sounds upgrade on your existing LS25 or an LS5 or Ref 2