I havent seen that many historical dramas because most of them seem to have like 80 episodes and my concentration limit usually goes around 30 epis, but here are some which I've seen:
Hong Gil Dong:
24 episodes, had good comedy & romance & tragedy & some fighting & lovable characters & Jang Geun Suk happens to be a prince... :D
Sungkyungkwan Scandal:
20 episodes, had a lot of romance & cute & funny & gender bender & not much fighting & hot guys <3
Iljimae:
20 epis, a lot fighting & tragedy & some funny scenes too & romance sucked & Lee Jun Ki
Chuno:
24 epis, a lot of fighting & some tragedy & romance kinda sucked