...and seconded (or thirded, or whatever). The EM4 range has two lines which are particularly post-apocalyptic:
the Savages (11 different models)
http://www.em4miniatures.com/acatalog/SAVAGES.htmland the Scavengers (8 different models)
http://www.em4miniatures.com/acatalog/SCAVENGERS.htmlThe lines aren't huge but the models can be converted and you can also convert other EM4 models to savages (bikers are quite suitable for this) or scavengers (rebels are quite suitable for this). You can see my take on the savages here:
http://combatzonechronicles.net/cozoxb/punks.htmAfter this bunch I made more conversions which will be featured in the Chronicles (along with their rides) in the future. My cousin (FM on this forum) made some great scavenger conversions which should appear in the Chronicles in the future as well.
Pimping aside, I can also recommend the Kallistra set: four good looking scavenger models, five savage/biker/mercenary types and one pimp for a small price. I made some piccies of those models with an EM4 savage for comparison:
They're a bit larger but quite nice.