Old Man's War by John Scalzi was made for this, I swear. His latest books also read a lot like movie scripts are contained therein.
Charles Stross' Laundry series has a ton of potential too, if less Chtullu is required, I wouldn't mind a Merchant Princes series either.
I heard rumours about Forever War being optioned at some point, but nothing came of it.
I second the suggestion of a Kobo. I have the Libra 2, bought after the charging port of my paperwhite gave up the ghost, and it's perfect for my needs:
Support from Rakuten has been stellar as well.