What is your top 10 Hi-Fi Milestones ?

Mine

Hifi that changed the world forever; Top 10 (no particular order)

Spendor BC1
SME 3009
Linn Sondek LP12
Krell KSA Series
Quad ESL 57
Marantz 1300 DC
Naim NAC32 -NAP 250 combination
IMF TLS80
Meridian 206 Delta Sigma
Apple iPOD