FWIW, if you're committed to getting a set amp and efficient speakers (other than horns) do some research on the interface of the amp's output impedence and the speakers imput impedence curves. Amps output impedence with tube amps is a largly undiscussed issue but is very important especially if you have a speaker with large impedence swings off nominal and they don't compliment the out put impedence changes from the amp. Its not simple, especially if you want to avoid chasing equipment that will not match.
Some quick, down and dirty discussions can be found in posts by Duke (Audiokensis).
Some quick, down and dirty discussions can be found in posts by Duke (Audiokensis).