One cannot help but smile while reading this thread...
For me, it was my most recent purchase: Mer-Man!
I was surprised at my preference to display the vintage head -he's just so cute! So far, the only thing that I'm changing is the sword. I'm going to add a stripe down the middle of metallic green paint to mimic the Wave 2-packs. Right now, it kind of looks like a giant corn cob on a stick in the solid yellow color.
I must admit that Mer-Man was not high on my priority list originally. However, once he was "in-hand" he was nothing like I thought he would be. Such an amazing, quality action figure with surprisingly impressive detail. I originally purchased him as one of Skeletor's henchmen, but once I actually had him in-hand he was so much more than that. His appearance has a royal quality that certainly makes him deserving of the MOTUC title, Ocean Warlord. It almost makes me want to customize little minions for him and construct a diorama to serve as a display backdrop. That is, if I had the extra space.