At this point, I have only been doing card magic, but am interested in "expanding". What other magic do you do? Coins, Rings, Change bag, Ropes, stage illusions, etc...
body magic. check out wayne houchin's stuff. things like stigmata, thread, sinful etc. other stuff like disjointed or pen magic like stuff from Shock F/X by andrew mayne or Marksmanship by Homer Liwag. Also look into Paul harris's stuff, his magic ranges from everything from cards to plants to hemorrhoids.
I really like W:H. In fact, he has really influenced my direction in card magic.
I could spend a lifetime just learning card magic and sleights, but am thinking of adding ropes, some silly change bag routine, some traditional magic if you will.