Suggestions please!? :"> 

This is highly recommended:
1. Queen Seon Duk
2. Ja Myung Go
3. Tree With Deep Roots
4. Empress Ki
5. The Princess Man

******I will edit my post coz I found another gem*****

1. Queen Seon Duk
2. Battle of Changsha
3. Ja Myung Go
 4. Tree With Deep Roots
 5. The Princess Man
Highly Recommended:

1. Jumong
2. Moon Embracing the Sun
3. Jewel in the Palace
4. The Horse Doctor
5. Dong Yi
6. Lovers in the Moonlight
Drama/Romance

1. Eternal Love 
2. The Princess Man'
3. Empress Ki 
4. Scarlet Heart Ryeo
5. Battle of Changsha 

Low on Romance 

1. Nirvana in Fire 
2. Battle of Changsha 
3. Six Flying Dragons
4. Bridal Mask 
5. Iljimae 
1. Six Flying Dragons
2. The Princess' Man
3. Moonlight Embracing the sun
4. Empress Ki
5. Love in the Moonlight
1. The Princess' Man
2. Empress Ki  
3. Scarlet Heart (aka Bu Bu Jing Xin / BBJX) 
4. Sound of the Desert


Excellent Historical .... BUT low on Romance
Nirvana in Fire   
Battle of Changsha 
Six Flying Dragons  
Tree with Deep Roots


NOTE: Best subtitles for The Princess' Man are on Dramafever .... and Gooddrama (but video quality is not high)
Other streaming sites like Kissasian and Dramacool have subtitles w/ overly complex English, in both structure and vocabulary :((
SCARLET HEART RYEO!!!!!!!!!!!!!!!!!!!
Faith
Sound Of The Desert
Journey of flower
Prince of Lan Ling
1 Six Flying Dragons
2 Empress Ki
3 Dong Yi
4 The Great Queen Seondeok
5 The Moon Embracing The Sun
Battle of Changsha
King's Daughter, Soo Baek Hyang
Scarlet Heart
The Young Warriors
Tamra, The Island
Princess' Man
Rebel ( currently airing )
Scarlet Heart Ryeo
I haven't watched Dong Yi yet, but Queen Seon Deok for me was really good! You mus watch it. Empress Ki as well. (^o^)
@Panda Dong Yi has a female lead with good values. I liked the character a lot. As for the story, it could've been told in fewer episodes. Overall, it's a decent historical with a great OTP. As for Queen Seon Deok, it's on my list along with Jewel in the Palace.

@Rainruma I agree with your saying that some historicals mentioned here are excellent but low on romance.
The princess' man
Moon lovers: Scarlet heart ryeo
Empress Ki
Queen Seondeok 
Both Dong Yi and Queen Seondeok are great. In Dong Yi, I liked the chemistry between the main pair, they are cute and funny. Queen Seondeok is really epic and I do think Mishil and Bidam really made the drama shine.

Lol I came here for drama recommendations but I already have most of the titles here watched or PTW-ed xD

My recommendations!
K-dramas: I also really liked Queen Seondeok.
Jumong
And one does not simply forget the classic Jewel in the Palace, how has no one mentioned it - or has everyone watched it already?

HK dramas:
Rosy Business
Beyond the Realm of Conscience
Sweetness in the Salt

And then there's also My Fair Princess, also another classic :)