Which high power SET

I'm using a push pull 30W and it's more than enough for my listening tastes. Hence the thought of SET for more refinement. To rephrase my question, which of the 3 on the list would be the best match for shindo masseto pre amp?

Many have expressed that harbeths are incompatible with SET.
Is this a problem of topology (SET vs push-pull) or stated power?
I'm using a el34 push giving out 28 watts and I hardly go have to go past 9 o'clock on the volume knob. To my ears, the 28 watts seem more than enough for me in terms of power with good frequency extension.

If it's topology, it means harbeths with its low sensitivity are generally incompatible with any SET amp, irregardless of it's power output. Given a hypothetical world where both push pull and SET generate the same power output, does push pull drive harbeths better simply because of topology?