I have owned Quads from 57s to 2805. I own the equivalent of the Mark Levinson HQD system with stacked Quad 57sQuad
The KLH Model 9s were wonderful, but kept breaking.
Due to space limitations, my current speakers are Harbeth 40.1s with Benchmark electronics and cables.
So: all Quad from 57 on (yes-subwoofers required) and Harbeth models.