I really wish there was a Dasaffe option on this one, simply because it is difficult to pick just one option. I always associate the OG in 'generations'.
The first five.
Then the five with Dragonsky.
Then Daina and Dragonsky with Red Star, Sgt. Misha and Lt. Gorky.
Then Daina, Dragonsky, Sgt Misha, Red Star with Big Bear and Ruslan.
Lt. Gorky never betrayed Daina and died.
Way back in the day I wanted to make customs of the OG using the back cover of the Annual (#2?). Red Star for Colonel Brekhov, Mace head for either Shrage or Stormavik, etc.
As for the figures themselves...
Red Star: One of my favorites to army build and LBC into other characters.
Big Bear '92: Another favorite to alter to make new characters.
Big Bear '93: Mail-in version I used to use as Big Bear when he was TDY w/the JOE Team, but lately I have been using him for a new character.
Colonel Brekhov '98: I have a number of these that I have put Taurus legs on with new heads for new characters.
Lt. Gorky '98 (Big Bear repaint): Not used as Lt. Gorky or another Big Bear, I use this one for a Border Guards trooper.
Volga: Absolutely different character than Daina. I use her as a Medical Specialist/Support.
Colonel Brekhov '05 (original look):
Daina: Placeholder figure for Daina until I steal a decent recipe to make my own definite version.

Dragonsky '05 (convention): Don't own, but planning on doing my own custom based on the Con.
Horror Show: Placeholder figure for now. Needs to have a bigger torso to be more comic book accurate.
Shrage: Fairly decent placeholder.
Stormavik: Fairly decent placeholder figure. (Would love to get a few more to customize, but this one seems the hardest OG figure to find anywhere).
Dragonsky '06 (comic pack): I've seen a few customs on here that look better than this Hasbro effort. He needs a Salvo head to look right, IMHO.
Lt. Gorky '06 (original look): Head sculpt is useful for other stuff, body is meh. I've seen better (accurate) customs on here.
Sgt. Misha Zubenkov: Perfect body for generic Spetsnaz troops. Simple headswaps make new characters. I would love to figure out a way to make a few troops with the hoods up.
Still working on an ARAH Ruslan custom recipe and a Big Bear winter gear (DDP)...
...and a whole lot of other ideas too.