Dude, the whole Lonesome Dove series still has to be some of the best books I've read. Hands down. Love them. Just getting into Vince Flynn. Reading Extreme Measures right now. Along the same lines is Whitley Strieber. Critical Mass was great! Also really into Nelson DeMille. If you have not read The Lion's Game, and The Lion, you are really missing out.
But, it was Major, and his suggestion to read Lonesome Dove that got me into reading books at all. I read that, and never realized how cool reading could be. Read the other three books in the series, and just kept finding new authors from there.