Samhain, I agree with you on the weapons/defense part. If the "marauders" were a TRUE threat, defense would come first-body, then home.
I also agree with the comments of the hand picked survivors-real world, I HIGHLY doubt you would have such a well rounded group, at least initially. Just for fun, if it were to happen in my community, you would likely find:

a firefighter.
3-4 bartenders
a handful of mechanics
Administrative people (most people in my town commute to Boston for work)-these would make up the majority of the "survivors"
Several active duty national guard or reserve people-all admin: mechanics, medics, paper pushers.
And me. But, I would be a marauder, so I dont really count