If you're into transparent, refined, audiophile sound for jazz, classical, country, all things acoustical, etc. - definitely... Legacy Calibre stand mount monitor, or Legacy Focus, or Legacy Aeris depending upon how big a sound you want and how much you want to spend.
They're "semi-open baffle" (Calibre and Aeris) and are efficient enough to be driven by tubes... and... are often shown that way at the shows.
Very little can match them for efficient speakers... unless... you're considering something with horns.
Though... if you have the space... you may like the best sounding speakers on the planet - restored Quad ESL-57's, which sound superb with tubes.
Just depends on what type of music you prefer and how big of a sound you want.
If you're into Rock, Hip Hop, etc... you might as well get Tekton's, or Zu, Golden Ear, or something like that.
