I'm sure that I'm forgetting a couple, but here goes.
Klipschorn
Celestion Sl6s
Celestion Sl700
Celestion Sl6si
TDL Monitors
Dahlquist DQ 20
Spendor SP100
Focus Audio 777
Reference 3a de Capo
Spendor 9/1
Nestorovic 5as
TDL Monitor (again)
Dahlquist Compact Monitor
Klipsch Epic CF 4 (9 years and counting)
Duevel Venus (recent aquisition)
I enjoyed all of them, some more than others (except for the Reference 3a de Capo, which I really disliked), and learned from each one more about what is important to me in a speaker. No regrets.