Intercooler analyses. Some technical, but cool info.
HERE is their work / calculations
They seem to like air/water intercooling the best, as it is almost twice as efficient as air/air (when they chilled the water) The only bad thing about air/water is the water weight, but I think it much more than evens out in comparison to air/air intercooling.
PS: I am researching for my intercooler setup, I did not just look this up for fun (just so you don't think I have gone crazy)

