I would go for Tiamat. Baring that, I want classic D&D monsters represented first before the various iterations of dragons. The fact that the first three are all dragons is expected, but not what I was looking forward to. When I first heard about the line, I figured "Finally, we'll see the tarrasque." But I guess they consider the colossal red dragon more of an icon to D&D than the tarrasque. Go figure.