1000 coins left. Choose your army carefully.

Unit: 20 coins
Base equipment:
junky armor - 0 hardness
wimpy gun - 1 per 1.5 seconds - 4 range - 3 damage
-or-
poor launcher - 1 per 3 seconds - 4 damage
awful tank tracks - 1 second to move, 1 second to turn
-or-
lousy car engine - 1 second to move, .1 seconds to turn

Other equipment:
decent armor - 1 hardness - 10 coins
okay gun - 1 per 1 second - 5 range - 3 damage - 10 coins
passable launcher - 1 per 3 seconds - 6 damage - 10 coins
alright tank tracks - .6 seconds to move, .6 seconds to turn - 10 coins
adequate car engine - .6 seconds to move, .1 seconds to turn - 10 coins

awesome armor - 2 hardness - 20 coins
great gun - 1 per .75 seconds - 6 range - 4 damage - 20 coins
excellent launcher - 1 per 3 seconds - 8 damage - 20 coins
amazing tank tracks - .4 seconds to move, .4 seconds to turn - 20 coins
wonderful car engine - .4 seconds to move, .1 seconds to turn - 20 coins

machine gun - 1 per 0.3 seconds - 2 range - 2 damage - 15 coins
radar - 10 coins
repair crew - heal 5 hitpoints per 3 seconds - 10 coins