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The higher the delta T the faster the heat exchange...
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That's correct. I think Zap was just trying to communicate that he doesn't want to use any sort of TEC/phase change to cool the water. He's shooting for extreme ambient.
IMHO, you are very hard pressed to beat the cascade's design, and even if you could, the complexity of making it wouldn't be worth for the .5C you (might) gain. Cascade can also be reasonably made with a saw and a drill press (from what I've read, still haven't had the time to "roll my own" though I want to some day).
For GPU and NB #rotor style scaled to an appropriate size will provide all the performance you need. Once again, reasonably easy to make.
The only idea that I have for you is to mess with the angle of the inlet/outlet. I've always believed that having a 45 degree inlet and a 45 degree outlet will lead to the smallest pressure drop and may actually increase heat dissipation across the block's surface. This wouldn't benefit the cascade, as, from what I can recall, much of its cooling prowess comes from a "re-circulation" effect of the water exhausting off of the cups in the base (the water hits the cups, curves upward, and then circles back to hit the block again at the wall between the cups).