Blacula
Despite some cheesy fx and some makeup work that should have laughable even back in the 70s a fairly strong vamp flick. Ok, yes it does have the whole "get killed by a vampire become a vampire" thing, which if true would have likely ended up with an All Vampire World about a month after the first vamp. But the reincarnated lost love is always a good concept to work with. And a couple of the attacks (one in the morgue by a newly risen vamp, the other against a photographer) are very well shot. Also even by vampire lore standards the version of Dracula at the beginning is a total prick...