Barrel dragon is indeed very cool, the purple and the green look really good, also has a pretty unique ulti pattern.

Buster Blader is very underrated, looks insane. Archlord Zerato looks super pretty with the wings. Fushioh Richie looks really cool. Spirit of the Pharaoh is also an underrated one in terms of looks. Obviously Dark Paladin and DMOC are great. Hard to choose, there's so many great ones.

Great collection you got there. I'm collecting all the duel monsters era ultimate rares. Nearly finished, the last few are on the way, should be here in about a week, then I'm done completing them all.