I picked up a copy of the Element Encyclopedia of Vampires for 4 bucks plus shipping for a reference on the book and I think it definitely would be handy if you do decide to go the vampire route in your book.
It's 700 pages and has entries about everything from historical vampire panics to folklore all the way to vampires in tv and movies. Not everything is useful but there's definitely enough to make it worth the low cost and having your own copy means you can notate it.
As far European vampires go, there are a ton of variations in "vampire species" (Upir, Upyr, Upor, Obour, Ubour, Murony, Moroi, Nachzehrer) those are just a few examples.
They vary wildly in abilities, how they feed, what they eat and many have some pretty weird traits. Like having only one nostril. Not sure why but there are several like that. There are also like 20 species that are just just floating heads with their spines dangling.
I'd advise you to get the book. It's an interesting read if nothing else. Personally though I think you need to just commit if you go the vampire route. They're so engrained in our minds that if they act like a vampire that's how the audience is going to think of them no matter what they go by.
If you decide not to do the vampire route the book still has a lot you might be able to use. You could take some of the traits from this and that and make your own creature.
I'll leave the link here. If you think of anything specific you'd like me to look up feel free to ask. Otherwise good luck.