In terms of space, you can install a 240 or 280, or even a 360 at the front (then simply without the HD cage), for example from bequiet or Corsair. I have installed two 240 radiators in the case myself, but for a custom loop (one 240 SE from EKWB at the top and one at the front, fans from Corsair). You just have to be careful that, depending on the mainboard and RAM, the radiator can only be installed in the front. The space at the top is very tight for the wheel + fan. In my case, for example, the distance between the RAM sticks and the fan at the top is just half a millimetre.