Anime is awesome, I'n not much a of a manga reader, I only read bleach and Nurarihyon online
hard to list a top five but I'll try.
Gurren Lagann is easily one of my favorite shows, so epic :D
Hellsing Ultimate, Amazing OVA that I love, Episode 8 comes out later this year :D
Bleach is always awesome, except for all the fillers, fillers is the reason I read the manga
Yu Yu Hakusho, bought the DVD sets and re watched the series which made me loved it all over again
Grandchild of Nurarihyon, This is a awesome show, I love it so much I started reason the manga and I never read manga.
I think I need more then five D: the above are my favs though
Darker than Black (Both seasons)
G Gundam, I keep meaning to watch Gundam wing
Zoids chaotic century and guardian force since I loved it so much as a kid.
Code Geass R2, I absolutely hated season 1 but loved 2.
Black Blood Brothers
The Vision of Escaflowne
The 12 Kingdoms
Dragon Ball & Dragon ball Z
I thinks that's all of the series I like. Although I know more are going to pop up once I press post quick replay O.O
Elrohir the plakat
Galah cockatoo & African Grey