Between the Antec 1200 and Cooler Master HAF 932, I'd pick the HAF 932. Two other options would be the Cooler Master ATCS 840 or the Lian-Li PC-P80B Armoursuit, but if you're going to use watercooling, the Corsair Obsidian 800D is a great choice.
I have the HAF 932 for one of my systems. It is a huge beast. Ventilation, airflow, and cooling are excellent with just the stock case fans. Plenty of room inside the case. Cable management is excellent.