I agree with you wholeheartedly about the current vampire models, they look like demons/monsters.
You could have a hunt on ebay for older vampire models. Plenty of the old metal 'bloodlines' models are great. The Mordheim Von Carsteins are favourites of mine:

ly human
They don't look quite so monstrous as their modern counterparts.
Otherwise, vampires Reaper are always a good be as they've got a bunch of vampire models, here's a couple of my faves:

But, they've also got endless human and elf minis that could work depending on what you want


Avatars of War do a great Vampire Countess model: