I really love Tsutomu Nihei's Blame, whic hhas a really subtle story but great art (it's a wierd twisted sci-fi style). The story is interesting, even though you have to read through his novels multiple times to understand it all.
I really need to pick up more of them >.>
Ive also read and enjoyed Megatokyo, which is just funny, Kami-Kaze which is kind of cliche'd but has alot of gore and complex panels, and a volume from one of the .hack manga series (can't remember which right now)