I am new to watercooling myself, but have been doing lots of research the last few weeks.
From what i have seen its probably more sensible to go with the thicker radiator, if i was doing it i would be leaning towards the UT60
I looked hard at that case for my next project, infact i would say go 360 radiator in the top and fit the Monsta (80mm) but thats because i think it looks epic! lol