Despite your genre preferences, these books are, you know, epic and should be read by everyone. Because they're awesome. If I never get to the other four parts--and the risk is always there :O--you'll at least know of THESE AWESOME ONES. The reviews themselves that I have written tend towards the overuse of words like awesome. Hopefully this helps to get the point across but really it probably doesn't.
It's supposed to, anyway.
How to Say Goodbye In Robot (Natalie Standiford)
Will Grayson, Will Grayson (John Green and David Levithan)
The Sky is Everywhere (Jandy Nelson)
Two Parties, One Tux, and a Very Short Film About The Grapes of Wrath (Steven Goldman)
Before I Fall (Lauren Oliver)
Sorta Like a Rock Star (Matthew Quick)
Marcelo in the Real World (Francisco X. Stork)
Hold Still (Nina LaCour)
How I Live Now (Meg Rosoff)
The Dark Days of Hamburger Halpin (Josh Berk)
The Less-Dead (April Lurie)
Split (Swati Avasthi)
American Born Chinese (Gene Luen Yang)
And so on, and so forth.