The age of this patron is very important since vampire sagas are written for both teens and adults. I am assuming that this customer is an adult who does not like Bella's relatively immature first person narrative and wants  adult vampire books with more meat, energy and passion. I may first suggest Ann Rice's Vampire Diaries. She is basically the creator of contemporary vampire legend. Her books are rich in every sense of the word - they also made her very rich -- her characters complex and setting luxuriant. If her books pose too much of an angst issue with the patron, I would suggest the quirky, erotic, violent and surprisingly humorous Sookie Stackhouse series by Charlaine Harris, lots of meat in those books and so, so many for the Sookie fan to read. Combined with the True Blood tv series, this may prove successful. Another great read is the Anita Blake series by Laurell Hamilton with a true female heroine vampire slayer and lots of adult action. For a truly dark and apocalyptic view of vampires -- and this viewpoint is currently a popular one as illustrated by AMC's Zombie apocalypse Walking Dead, I would recommend the Strain trilogy by Guillermo del Toro which narrates the end of the world via vampire virus in New York City. This series is more scientific in nature dealing with the biology and development of the vampire.