I assume by radiator you mean AIO, all-in-one. Like a NZXT Kraken or Corsair H110i? Not, which custom loop radiator can I cram into my case.
Your case will support just about all options. 120-360. The minimum size you should get is probably a 240, smaller than that and you aren't doing much better in terms of temps over a similarly priced air cooler and it may actually be louder. I think just about any option 240 to 360 from corsair or NZXT will treat you right.