For me, two amplifiers stand out from the crowd. Both of these introduced the world of hi-fi to me, introducing a higher-end sound for budget cash:
Audiolab 8000A
Pioneer A400
Speakers wise, my hi-fi life changed when I first heard a pair of Quad ESL 63s. At that point I knew I had to have a pair of electrostatics, the life in the vocals just knocked me sideways - gorgeous!
Quad ESL988
My first pair of real speakers and ones that convinced me I should get into hi-fi properly. Tannoy Mercury S Golds in 80s attire. Gorgeous weighty sound, perfect for synth bass lines and squelchy riffs.