Don't forget vintage Crown D Series amps as well

If the OP hasn't done this already, a good look on the Harbeth site and the user group would be a good idea, as along with personal subjective opinions in one area, there are research papers and articles on the speakers themselves, with advice on how and where to use them.

By the way, the SHL5 has an extra half to one octave of bass extension, but it does need careful siting away from walls for the bass not to overshadow the lovely midrange it has. Just my thoughts...