The Dragon was outdated way back in 2004. Inadequate cooling for sane noise levels.
PAULRYAN52 ANY case will fit watercooling, give me enough money and I can make you a mini ITX watercooled rig if you so desire.
The questions you need to ask are what rad do you want, where can it go etc.
I know of no cases that can not fit watercooling, the question is what do you want to fit and do you really need it?