I'm not all that interested in most of the specialty Vipers, so I pretty much have one of each except:

2x Tele-Vipers (1985)
3x Vipers (Sonic Fighters)
6x Vipers (Viper Pit)
3x Vipers (VvV blue & red)
3x Vipers (Viper Lockdown)
8x Cobra Troopers (TRU Infantry set)
2x Cobra Troopers (Comic Pack)
4x Cobra Officers (TRU Infantry set)
2x Cobra Officers (Comic Pack)
1x Cobra Officer (1982-- That's right: Straight arm, baby!)
8x Crimson Guard (3 from Operation Crimson Sabotage and 5 from one of the TRU sets)

Other than those, I have a few duplicates here and there like 2 Siegie Immortals, 2 Desert Scorpions, 2 Flak Vipers (one blue and one neon pinkish-red), and 2 Incinerators.

I've done a little bit of army-building with the 25th figures too. I have:
5x Cobra Troopers (1 five-pack, 2 single cards, 2 Legions)
3x Cobra Officers (1 single card, 2 Legions [except as I detailed in the forum, one of the Legions versions lacks his officer helmet])

If/when they release the red-logo trooper on a single card, I'll probably get one of those too. I also plan to get one Siegie plus the comic pack which will give me a second (and a Scar-Face Cobra Officer too!)

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is on indefinite hiatus...