Lucifer's Hammer is teh awesome.
The Road is good, but full of stupid at times, too. At least to the prepper-oriented community.
I've read Lights Out by Halffast. That was pretty good. A bit gear-queer (which most amateur efforts tend to do).
The Stand isn't that great, IMO. It's a fantastic book... but not from a study of the Apocalyptica genre.
Patriots (by Rawles) is very gear-queer, also. Idyllic. Over the top, IMO.
I really liked the Enemies Foreign and Domestic, Domestic Enemies: The Reconquista and Foreign Enemies series by Matthew Bracken. I feel bad for Ranya and I'm glad she only had to make it through 2 out of the 3 books!
I also really like Unintended Consequences as a candidate for this genre.