If you prefer longer dramas then:
- Dong Yi
- Jewel in the Palace
- Queen Seon Duk
If you pferer something mixed (fantasy)
- Arang and the Magistrate
- Gu Family Book
- Queen In Hyun's Man
If you prefer some movies:
- House of Flying Daggers
- Curse of the Golden Flower
- Masquerade
- Red Cliff 1 and 2
- The Restless
Hwang Jin Yi - was also my first Korean sageuk, so if you prefer smtg "similar" to "Geisha's Memories"... ;)
If you are interested in certain period of Korean history or in regin of certain King, you can look at
my little list, which will help you find which dramas are taking place in that time period :)
PS. Happy to see another person who loves historical dramas ^^