As noted above, True Blood vampires (the only one’s I’m personally familiar with) can live perfectly well without ever killing anything. I’m still on the fence about it, but would probably take the deal, mostly because I’m so curious about how society will evolve. So much has changed in the past hundred years, I’d love to see what happens next.
Another example would be the Sonja Blue series, where vampires are created when someone is drained of blood and the corpse infested with a basically mindless demonic entity. The entity raises the corpse, but the result is a feral creature driven by thirst because of brain damage due to death; the entity has to think with the brain of its host, but that brain isn’t working too well right off. Eventually they heal that damage (which is also why their powers get stronger over time; they are healing), but result is a predatory creature that only remembers the life of its human predecessor. Sonja Blue is unusual because she was dumped near a hospital and got modern emergency medical care immediately; so she never actually died, her human personality is still there and she’s as powerful as much older vampires because she never had to heal any damage to her brain like they did. And she not the demon is (mostly) in control.
In fact I understand that the Sonja Blue stories were an inspiration for a lot of later ones, so a lot of their features sound a little cliched because they created the cliches.
I could give serious consideration to being a Christopher Moore Bloodsucking Fiends-type vampire. I really liked Moore’s take on the whole issue of feeding, and there wasn’t any personality change in Jody other than what came about as a result of the powers she gained.
It’s not the same thing. We want to kill Edward and Bella because they’re Edward and Bella: the fact that they’re vampires just makes them more grating. Unless Twilight vampirism causes douchebagginess, we’re fine.