Andrew
Sorry for the delay--have been on the road the last two weeks. I have heard all three.
I myself like the warmer tubed sound better with these speakers and would recommend the Almarro or something similar. I would imagine that another Japanese integrated amp, Leben, would also sound great--heard those with Harbeths, which have a similar sonic profile to Spendor. The Almarro is 1/4th the price of the Leben and the tubes are based on the Hammond organ.
In 30 years, I have found that the Brits always make solid musically inclined products. LFD would be a nice match and Gene Rubin Audio in So. California is an excellent source for all things English.