since i'm reading a lot at once because i'm waiting for a new vol. to be released i will mention only a few at a time which usually have a new chapter every week.
ahhhhh...it changes quite often since I didnt read that much manga yet, but currently I would consider the works of Asano Inio as my favorites
like oyasumi punpun and umibe no onnanoko
Eden: it's an Endless World. I tend to like seinen and this was really well done. Fell apart near latter part of the series but I thought the premise and plot near the beginning-middle were superb.