I would suggest:

Paranormal
1. xxx Holic / xxx Holic Kei
2. Natsume Yuujinchou/ Zoku Natsume Yuujinchou
3. Ghost Hunt

Romance
1. Saiunkoku Monogatari
2. Skip Beat
3. Special A

Action/ Shounen
1. D.Gray-Man
2. Pandora Hearts
3. 07-Ghost
4. One Piece
5. Full Metal Alchemist/ Brotherhood
6. Code Geass
7. Get Backers

Vampire
1. Hellsing
2. Trinity Blood
3. Vampire Knight (romance + action)/ Vampire Knight Guilt

Historical (shounen)
1. Peacemaker
2. Samurai Champloo
3. Samurai 7

Comedy
1. Azumanga Daioh
2. Full Metal Panic! Fumoffu?
3. Zetsubou Sensei

Sports
1. Prince of Tennis
2. Slam Dunk
3. Dear Boys
4. Okiku Furikabutte!

Gender Bender
1. Ouran High School
2. Princess Princess
3. Sengoku Basara

Others
1. Fruits Basket
2. Gundam 00

I have yet to watch Gintama... looking forward to it. Also highly recommend Last Exile!

This post has been edited by sweet_pez: Feb 5 2010, 02:22 PM