From a practical standpoint, I quite agree with you, Jaydee. Agonizing over a 1C differential is nearly a waste of time. However, the reason that many of us DO spend considerable energy upon it is for two reasons: 1) we like to understand all the ramifications and intricacies (the theory, if you will), and 2) we are raving mad enthusiasts.
Despite the urge to gain that last degree of cooling, active cooling is indeed the real answer, and phase change is probably the best bet for now.
I still want a copper waterblock though.
