I finally found a little time yesterday to clean up the office a bit, so here’s a photo of a few of the weekend’s findings:

The Fighting Stallion is going to be a restoration experiment, the Bucking Bronco is a keeper (near mint, and just super!) and since I already own that particular variation of the Gem Twist, he'll be heading to the sales list after a bit more work.
The Gem Twist is from the first year of production (1993) and though you can’t see them in the photos, he sports the long, fully painted braids. The second version had the same braids, but with "ribbon dots" instead, and the third version had remodeled ribbons with similar dots. I don’t own the second version, but that’s more a matter of a lack of will than a reflection of its rarity: I have no idea which one is the rarest, to be honest. Haven’t bothered to do the research, though I probably should.
Aside from the ribbon remodeling, there was another significant, but invisible, change made to the mold: it was made less tippy. The earlier examples of the Gem Twist mold are extremely unstable; that glorious Moody tail made him exceptionally bottom heavy. You’ll find some that are "weighted" correctly, but it’s very hit or miss, and the guy I picked up Sunday is definitely a miss.
(He’s in otherwise pretty nice shape, other than a light scuffing and yellowing, so whoever owned him previously didn’t play with or display him much.)
Later models made with the Gem Twist mold tend to be less tippy, so Reeves was evidently aware of the problem, and took steps to correct it. I suspect some work was done on the interior surfaces of the mold (some areas shaved, others built up?) to even out the weight distribution. He’s still not the most trustworthy model on the shelf - none of mine are currently on display, mostly because of "Hurricane" Vita - but it does take a little bit more than a sneeze to knock the later examples over.