I'm not really a big fan of all the Viper special corps, so I'll go with these simple ones:

1. Cobra Troopers (preferrably the TRU Infantry Pack versions)
2. Cobra Officers (also the TRU ones)
3. Vipers (TRU Viper Pit versions, only because I've never owned the '86 one)
4. Red Ninjas (TRU Cobra Ninja Clan versions)
5. Night Creepers (original 1991 versions)

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is on indefinite hiatus...