I most love the Aleroth Archmage set just because of the thing "serutan" mentioned in his/her spoiler !
But I wish to say a little bit more about that :
Even with only the Belt (with fast mana reg!) + 1 other piece of the Aleroth Archmage wearing, the Belt give you already a fast mana pool regeneration ! My hero was wearing the Belt + 1 other thing of this Set to the end of Flames of Vengeance!