I have used a Thermaltake Soprano case for my P4 and an iCute case for the conroe... Both are nice looking, but not too hot cooling, inspite of the number of fans, however, the icute has 2x80mm that blow over the PCI slots, and I have used a modded air-flow duct to blow over its NB Block, and the Soprano fan on *** side window blows fairly well enough onto the Block to help out there... I have replaced the fan however with a Zalman and that alone has let me drop 6c on the NB.
In ever realised that my NB is actually hotter than my CPU? - is that normal?
Anyway, the case isnt really all that good as I said, however, noise isnt realyl too much of a worry and I am soon to be adding a pair of Papst 120mm in the front & rear just as soon as I can be bothered to. The iCute case is doing a better job even though its only got a single 80mm on *** front, however, the system overall is a lot cooler than the P4 one... Saying that, the P4 is hitting 4.2Ghz, so what do I expect?