I've got a suggestion.
There is this series called The Mortal Instruments written by Cassandra Clare. Very well written and totally different than Twilight. If you like anything related to demons, angels, and that type of thing you'll like this book series. The author based it off of Dante's Inferno.
And then there is the prequal series called The Infernal Devices.
go to this link: http://mortalinstruments.com/
there you find more info on the books. i hope you take a look at them. like you said, you can take only so much Twilight before you go mad.