Autechre for sure. Lately 'Deepchord' and Pole' stuff I have been playing loud is simply gorgeous. Also, anything from Luciano- He knows how best to use mid-bass..
I have this Audiofon CD of Valentina Lisista's Virtuoso Valentina Vol 2 solo piano just begs to be played life-like loud. The recording is one of the cleanest. My whole house is filled with life-like Piano sound- every nuances, tones and undertones in-tact.