I only fucked up at 82 because I was dicking around with Winamp and let 9 enemies through in the first couple waves, so I was down to 1 citizen for the whole rest of the game. 1 got through on wave 82, and that was all she wrote.
I don't remember how I did the 86 before. I want to find that screen-shot so I can copy my formation and redo it.