Using my Mac Pro right now, but have a new Mini arriving today, so here's the rig:
2010 Mac Mini - 40 GB OWC SSD, 4 GB RAM, bus-powered external 500GB 2.5" drive for music
iTunes (catalog) + Pure Music 1.65
XLD (w XLD Secure Ripper) for ripping on the Mac Pro
Max to convert FLAC to AIFF (for HD downloads from HDTracks or Linn)
Mini is controlled by iPad with Apple Remote & Jump (VNC client)
Apogee Duet (potential upgrade later)
Ray Samuels HR-2 amp (potential tube upgrade later)
Sennheiser HD600 w Cardas cable
Cardas Gold Cross interconnects
AQ power cable for Mini
old PS Audio Prelude power cable for HR-2
Keith