If I'm not mistaken, the Anten H2O 920 has 2x120mm fans included with a larger radiator than mine. The fans screws mount into the radiator, so 200mm won't work.
You would set this up in a push/pull configuration. Rear Case|<-Fan|Radiator|<-Fan.
I know the recommended set up in to blow fresh air into the case thru the radiator, but many people advise against that! Set it up to blow air out of the case. With your case, the air is not going to be hot.
apparently though the antec 1200 has compatible screw holes on the 200mm fan to mount other fans on it.