if there is a 120 x 2 on the top, then get a 240 rad. you want to get rads that fit the fans, if that makes sense. so if theres a 140 x 2 on top, then get a 280
A 200mm radiator wouldn't have enough clearance from the motherboard, as depicted by this image.
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Only option is a 120mm/140mm at the rear. You have limited radiator mounting options, getting an AIO like the Corsair H80 would be the best way to go.
Take a picture, it will help to decide whether it is feasible. Even so, a low static pressure 200mm fan in a pull orientation doesn't help when you have an airflow restrictive radiator.thats a dif ver of the 900, mine doesnt bubble up around the fan on top, theres a little space between the top of the board and the top of case
Looks doable but no guarantees. External mounting of a 240mm radiator with a Radbox at the back would be a safer bet but not everyone likes the look of external mounted radiators.