Something like the define s, that can fit a 3x 140mm but still have clearance, also not particularly fond of the gaps on the top of the define s, it would be nice if there was something to cover the holes like the MasterCase Pro 5. It doesn't really matter if the radiator fits only on top or side main goal is small and quiet so sound dampening foam/no window is a bonus.
I dont know Amy specific cases... Look for cases without the optical drive bay as all of those support 360's in the front just read the fine print to see if a 420 will work.
I have a Phanteks Enthoo Pro and you can fit a 420 rad in top but, if I recall correctly, only slim rads can be fitted in the top. You can get it in a non-windowed version and maybe add some sound dampening material yourself.