I've mainly copied and pasted this from another thread where people were looking for YA, but these should apply to you too as I've listed some of my favourite (and extremely well written) series/books. You should have fun with them if you pick any of them up.
The Pure Trilogy by Julianna Baggott ~ Seriously amazing & beautifully written post-apocalyptic trilogy.
Blood Red Road by Moira Young ~ cross between a Western, dystopian & post-apocalyptic. First 50 pages slow but after that really good.
Mortal Engines by Philip Reeve ~ My favourite series of all time, light steampunk/sci-fi (not really though) about Cities eating Cities - the opening line: “It was a dark, blustery afternoon in spring, and the city of London was chasing a small mining town across the dried-out bed of the old North Sea.” And if that doesn't catch your imagination, nothing will
Chronicles of the Icemark by Stuart Hill ~ excellent high fantasy with very large, well written battles and lots of original ideas (no dragons/elves/dwarves etc etc) also wonderful female protag
Airman by Eoin Colfer ~ author of Artemis Fowl, Airman is in my opinion his best book. Historical, about flying machines. v. exciting
Here Lies Arthur ~ highy original take on Arthurian legend, by Mortal Engines author.
I Am Not a Serial Killer by Dan Wells ~ horror with some supernatural elements about a sociopath. Bit like Dexter.
BZRK by Michael Greant ~ Great, highly original series about nanotech and biotech wars on/in humans. They're really pacy and quite edgy thrillers.
As for Divergent - it's good but a little derivative, in my opinion. And the sequel isn't great.