Let The Right One In.
Guillermo Del Toro's The Strain Trilogy
ETA: Aw, apparently I'm the only one who liked The Strain Trilogy? Yeah the final book was kind of lacking but the first two were creepy as heck.
The Strain Trilogy was all right (yeah, funky ending), and it certainly had gross and scary vampires in it and plenty of truly terrifying bits, but I wish del Toro had written it by himself. I found the prose uninspired, as is often the case with collaborators, in my experience.
Let the Right One In rocks the genre. Lindqvist is brilliant. It's right up there with my all-time favorite
Salem's Lot.
Lefanu's "Carmilla" is indeed one of the crown jewels in shorter vampire fiction. I would add two by E. F. Benson, "Mrs. Amsworth" and "The Room in the Tower." Then there's F. Marion Crawford's "For the Blood is the Life." And a tiny gem by the great M. R. James, "An Episode of Cathedral History." Though there's no telling what Count Magnus really is, he does have some lovely vampire-like aspects, so hey, grab James's story of the same name while you're at it. You won't be sorry unless you're prone to nightmares.
Vampires aren't the main course in Lovecraft's
Case of Charles Dexter Ward, but one does make a brief and chilling appearance as one stage of the resurrection process, and there are plenty of other terrors in store besides.