Nurarihyon no Mago
211 chaps in 51 uploads - long complicated story that is worth reading.
Rurouni Kenshin
258 chaps - One of the manga that got me hooked on manga (although I would have liked it even more without the chibi).
Tsubasa: Reservoir Chronicle
235 chaps - not just a jump to one world, but many. Quite a bit if diversity and decent art, but the story can get complicated.
Tail of the Moon
105 chaps - A good story with diverse characters, although many are too stubborn for their own (or anybody else's) good.
Kamisama Hajimemashita
131 chaps...+ (ongoing) - NHM= Fox yokai
Tokyo Crazy Paradise
109 chaps -
Fruits Basket
147 chaps - A nice read with character diversity, growth and reconciliation. It's one of the manga that you may come back to from time to time for whatever reason and find yourself rereading from whatever point you jumped in at.
Soul Eater