I would chose the variation of a vampire, which is rougly based of off warhammer vampires, you would be faster and stronger then normal humans. The variation is not that affected by objects like garlic except if the person using it actually beliefs it will work. Attacking the heart will not kill you, but could mortally wound, making you consume lots of blood to repair. All wounds can be healed by consuming copious amounts of blood and given time as well to heal. Also the vampire bite would not kill or change whoever is bitten unless the biter wants to change them, instead it gives a form of pleasure to the bitten, making them want to be have you bite them more. With that you could get people from high places to do what you want. You could choose to learn how to change to an animal, and also magic but it would be a choice you don't have to make. You would also be immortal and could learn necromancy to raise the dead.
The majority of this info i got from the book "Gotrek and Felix: Vampire-slayer" It has a lot of interesting info, though it is mostly for fans.
(edit: The reason i wouldn't choose human is for the simple fact that, well vampires are the perfect predator against humans, the only winning factor they have is numbers and even then they are to busy killing each other to notice a couple homicides in the cityies)