I am pretty sure the Plinius is not truly balanced, so with that pre amp I would look into the other two. I am not familar with the levinson but that model sounds like it hasn't been made in a while. Come to think of it all of those choices I believe are no longer being produced. I have had great luck with BAT, in particular if you have a good truly balanced preamp, you would get better results using a truly balanced amp.
BAT VK-200, Plinius SA100 MK3, or Levinson 27.5?
Which of these amps would you Audiogoners prefer? I have a BAT VK5i tube preamp and Tyler Acoustic reference speakers. I know system synergy is important but mixing is fun also.
Sam
Sam