I thought about adding the Horntail dragon to the hogwarts roof and low and behold:
http://www.barnesandnoble.com/...an-horntail/30078852
It says that the display is 7 inches, but I figure that's with the case, so the dragon itself is 5 - 5.5? A bit large but Doable. The Detail is amazing.
I think Barnes and Noble regularly has coupons that we could apply to this. Right now there is a 15% off 35 dollar purchase w/ code MOREISMORE. Personally, I'll wait until the coupon hits 25-30% off. I just need to find suitable figures now! That Quiddich set was tempting...