If you have access to older White Dwarf magazines I'd recommend reading some of the official battle reports around issue 190. I remember The Heist in issue 198 to be terrific (Escher vs Ratskins), especially since they used the same Escher gang in a later issue (203) to see how they have evolved.
Check here for the full listing of official Necromunda material:
http://www.gamehobby.net/subject_indexes/subject_necromunda.html
Too bad
GW is so terrible at continued support of their specialist games.