It surreal to need Babelfish on ProCooling. I like what it does to Ben's sig.
Personally, I would say 5 m of head minimum. That gives you extra pressure to be used for flowmeter, pressure sensors, and thermometers. It is better to have a too powerful pump.
For units, I suggest working in L/minute and mH2O (meters of water). Both are common in waterblock reveiws, both are a good size, both are easy for people to visualize.
What website will publish your waterblock testing?