I'm with Renmiri, there are way too many to list for me.

For something funny watch Irresponsible Captain Tylor or Tenchi Muyo! OVA
For something artistic watch Haibane Renmei or Last Exile
For something action packed watch Big O or GunGrave
For something romantic watch Kare Kano or Voices of a Distant Star
and for something just overall awsome, watch Cowboy Bebop