All good suggestions, above. Here's more:
If you are a vintage horn guy (in my order of preference):
Altec Lansing - Model 19, 14, 17
Klipsch - Khorns, La Scala/Belle, Cornwall, Forte/Quartet
If you are not a horn guy (same order of preference):
Audio Note - AN-E, AN-J, AN-K
Triangle (various models)
Fritz
Devore
Coincident
If you are on a budget or want a cheap way to test HE speakers:
Klipsch KG-4 (horn)
Snell E, J, K (original or /II models)
If you are a vintage horn guy (in my order of preference):
Altec Lansing - Model 19, 14, 17
Klipsch - Khorns, La Scala/Belle, Cornwall, Forte/Quartet
If you are not a horn guy (same order of preference):
Audio Note - AN-E, AN-J, AN-K
Triangle (various models)
Fritz
Devore
Coincident
If you are on a budget or want a cheap way to test HE speakers:
Klipsch KG-4 (horn)
Snell E, J, K (original or /II models)