Umi no Misaki, Hare-Kon. Recommendations
As a harem manga, Umi no Misaki and Hare-Kon are basically in the same vein. I label them "true harem manga" where the main protagonist does not shy away from the harem idea itself, instead he embraces it and actually follows through without displaying much favoritism toward a certain girl. The setting is also quite similar; due to different circumstances, they are living together under one roof. If you like these kind of elements in your harem manga, look no further, these two are for you.
Well, if you are looking for a harem comedy beyond the normal boring shounen setup, well hopefully one of these will suit you. Hare-kon, while still fairly new it has the original premise of a girl who is invited to become the third wife, and even though umi no misaki have a very conventional setup, it have a very unconventional execution and is way beyond most harem comedy tagged stuff.