I have all of the Heaven ones, the Flowers In The Attic ones, My Sweet Audrina & the Dawn series
(All of the pages are yellow now, though - they're so old!!!)

Haven't read one for a reeeeally long time - not sure if I've read past the Dawn ones, but was that where the author changed?

I think I read the whole Heaven series about 5 times over - that series was by far my favourite