Don't worry about it too much.
Anything like an Eheim 1048 (1/2" in and out) or better will give you very good results out of the Cascade block.
The thing with the Cascade block is that its performance scales quite well with stronger pumps.
This leads to some confusion. You could use an Eheim 1046, or heck, even the baby pump that I used, being a 50cm head 200lph pump, and still get good performance with the Cascade.
The trick here though is defining "good" in reference to "what?".
The block will perform well no matter what pump you throw at it. It's possible to eke out another couple of degrees by using a very strong pump and a large radiator setup, but by now we're well into the point of diminishing returns.
Given a radiator that will fit in your case, some moderate speed fans, and the Cascade, we're probably talking about less than a 1C difference in final CPU temperature from an Eheim 1048 to an Iwaki MD-30RZ. Given a much larger radiator setup the difference will be greater, but even there, maybe a 2C difference at best.
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