Assuming you are going to side mount the radiator, and are not worried about flashing lights / RGB, then you can't go wrong with the Arctic Freezer 2. The 280mm version just about fits. It's tight, but doable. Alternatively the 240mm will probably be sufficient, though maybe a tad louder than the 280mm.
The air for the AIO will be getting pulled from outside the case through a well ventilated panel, so thermals will be just as good if not better than many Mid-towers.
Slap a couple of slim fans on the bottom (or 25mm fans if they will fit with your card) and two fans at the top for exhaust, and you will have a very well ventilated system.