well...not sure if you watched  One Piece ,but you should because its and awesome anime,also Fairy Tail is another great one ...
Inuyasa , Death Note , Hellsing, Fulmetal Alchemist -> these are the popular ones ( Dragon ball z ,I think everyone knows it since it's like the God of anime )
You can also try :
- 11eyes
- Air Gear
- Angel Beats
- Ao no Exorcist
- Beelzebub
- Berserk
- Black Lagoon 1&2
- Chrome Shelled Regios
- Code Geass 1&2
- Cromartie High Scool
- D.Gray-man
- Darker than Black
- DN Angel
- Full Metal Panic , all seasons and the alternate version "Fulmetal Panic? Fumoffu"
- Ghost Hunt
- Gintama
- Great Teacher Onizuka
- Heroic Age
- High School of the dead
- Katekyo Hitman Reborn
- Kaze No Stigma
- Kiba
- Samurai 7
- Shakugan No Shana 1&2 cause 3 isn't worth watching 
- Shaman King 
- Slayers ,all of them ,the father of Adventure animes
- Soul Eater
- Special A
- Trigun ( hit yourself with a sharp object if you haven't watched this one    )
- Zatch Bell
These are my favorites and I HIGHLY recomend you to watch them !
some are old, some are new and some are disturbing but all of them are awesome .