My all time favorite is Rave Master, its the one manga that i will not read online, the one that i will buy. The art style is great, there is always something going on in the backgrounds, its similar to eiichiro oda's style, due to them both being influenced by Akira Toriyama, but the character development is amazing, story line is well paced, and he also currently has another ongoing manga, fairy tail, as well as a collection of smaller stories.