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Twilight Saga by Stephanie Meyer (It's amazingly good and very wel written)
Immortal Series by Alyson Neol (It's not really vamps but they characters have the same powers and stuff as vamps, it's like HON)
House of Night/Marked by P.C and Kristen Cast
Vampire Kisses by (don't know, lol)
Vampire Academy I've heard is good but you never know ;)

I know. I hane the first six books to this series nd each love story gets better and better!!!!

morganville vampires, vampire academy, that's all i can think of. have more in my bookshelf.

Vampire Kisses
Book 1
Vampire Kisses (2003)
by Ellen Schreiber

It looks like there are 9 so far in this series.

morganville vampires, house of night #8 and #10,

Vampire Academy is the best vampire series ever. I think I liked it more than Twilight (and I LOVED Twilight).

Morganville Vampires was pretty good too, haven't finish the whole series yet though.

Chicagoland Vampires, My Blood Approves, Vampire Kisses, Bloodlines (like Vampire Academy, but with different characters, I need to read this badly!).

I haven't read these, but they are on my 'to-read' list. Some of them are not vampires, but they are all young adult paranormal stuff:
The Immortals by Alyson Noel
Forever Girl by Rebecca Hamilton
The Chemical Garden by Lauren DeStefano
The Infernal Devices by Cassandra Clare
Study by Maria V. Snyder
Unwind by Neal Shusterman
Darkest Powers by Kelley Armstrong
Fever by Karen Marie Moning
Spellbound by Cara Lynn Shultz
Parasol Protectorate by Gail Carriger
Uglies by Scott Westerfeld
Delirium by Lauren Oliver
Divergent by Veronica Roth

If you don't mind copious amounts of sex, Laurell K. Hamilton's Anita Blake series is actually really good. I also enjoyed her Merry Gentry series.

Anne Rice's old vampire books were also very good, though not the type of love you're probably looking for.

by jr ward
by sherrilyn Kenyon

both great series

Jeaniene Frost..Halfway to the Grave (Night Huntress #1) Is a good series. There's a few spinoff books too

Dracula by Bram Stoker.
Vampire Academy series by Richelle Mead.

I ABSOLUTELY LOVE the 'Southern Vampires' series by Charlaine Harris...!!

i agree with Amanda about the Anita Blake series, though from like book 8 it does turn very X rated.