Good books to read?

Hi - I'm an avid reader and have recently been stuck in a rut, reading the same books that I have, over and over. I'm actually rather sick of my material now. Does anyone know any really good books that I could check out? I'm into clics, books that have some type of historical reference to them, but could still be considered fiction, autobiographies; basically, books that have substance to them. Really, any suggestions would be helpful though - please, none from Oprah's book club! I have read a few on her list and have yet to find that I like the same type of reading material she apparently does. Thanks.