I like
Waugoshance as it was
Waugoshance as it is
Sabine Pass
Detroit River
Pottawatomie LL
Baileys Range set
Erie Land Light
Wisconsin Point

These are special to me because I either picked them to be made or had a hand in the selection.

Other favorites:
Old Michigan City (the "home light")
Michigan City East Pier (almost "home")
Racine Reef
the Exposition pair
(because both are very interesting & unique lights)

Other really great Harbour Lights, IMO, include:
Cape Canaveral LE
Hooper Strait attendee version with the removable roof
many of the lenses

You will find that favorite lights may be chosen because of a personal attachment or because they are very interesting lights or because of the hunt people undertook to find them. Lots of interesting stories and reasons for favorites.