Wayavas posted...shud i build manamune and warmog like evryone says?
That's not the only build, but tear is essential, if not a requirement, and warmogs is pretty good for him. I would make sure to max the mana regen mastery too.
Just keep in mind that your ghouls scale off your AD and Health. His W has good AP scaling, but I don't think that it is better than going tanky AD.
Other good item choices:
Spirit Visage (If you don't get it somewhat early, I wouldn't bother)
Frozen Fist
Frozen Mallet
Atmas Impaler
Swift boots (catching up to people can be annoying sometimes)