I'm using Almarro 318B 18 watt SETs with mine. The dynamics and drive are suprisingly even better than the Hypex UCD400 dual mono amps I was using previously. While tube amps traditionally have plummy bass, the bass definition on my setup is very good after some room treatment to reduce bass standing waves.
I find that toeing in improves palpability and the density of the sound, but tends to accentuate a brighter tonal balance. Toeing the speakers closer to zero degrees tends to reduce the "meatiness" of the sound, and de-emphasize the treble.
YMMV.