If you have been enjoying the episodic release of Higurashi When They Cry, then you absolutely must check out Umineko When They Cry. The visual novels are not correlated in story but do share their mysterious themes.
Umineko When They Cry shares a story about power, money, witches, and much more blended together in a masterful way. The current release on Steam is comprised of the Question Arc (the first half of all chapters) with Answer Arc coming later.
MangaGamer have given Umineko When They Cry a launch week discount of $22.49 on Steam if you pick it up before July 15.