Watercooling: two radioators?

[t00lb0x]

Its a rule of thumb, bigger is better when it comes to heatercores. And heatercores come from automobiles. To find a good one that works for you go here
Or just http://www.pullmanford.com/heatercores/
And most watercoolers now use heatercores because it is cheaper and doesn't restrict flow as much.