If you want an anime like Vampire Knight I highly recommend Blood + (Blood plus). It's just like Vampire Knight! Watching it made me feel that Vampire Knight copied a lot from it (Because Blood + was made sooner than Vampire Knight).
It's about a girl named Saya who is a lot like Yuuki. Not by the appearance or personality but by the story. I don't wanna give out spoilers though. It is filled with action, drama and romance.
It's released in 2005. You should definitely watch it!
And there's Fortune Arterial! It's a little bit like Vampire Knight only it's more... cute? xD And a little less blood spilling. But apart from that, it's a very nice vampire anime. It has a lot of comedy, drama and romance! Some little violence... And mystery of course!
Fortune Arterial's story revolves around the male protagonist Kohei Hasekura, who transfers into a prestigious public school in the style of an English six-year school encompassing junior-high and high school students. The school, named Shuchikan Academy, is on an island named Tamatsu Island off-shore from mainland Japan, and the only way to get there is by boat. Soon after transferring, he discovers that one of the students in the class next door to his, is in fact a type of vampire.
It was released on 2008. You really have to try it out! =3