Well by all means, start with what you like! If you ever feel like you're in the mood for something different, post apocalyptic is just a story that takes place after the world as we know it ended. They're fun in a stressful kind of way, lol! :-)
Well, Unseen is my newest, and current favorite. I'd probably start with that one. ;-) But, if you like post-apocalyptic books, The Dead Room will be out in 2 weeks. You could wait for that one. What do you like to read?