Keep in mind this is an article for n00bs. I was shooting for a general overview. I had links to the overclockers.com, procooling, overclockers.au and futuremark forums, but the sysopt editor took them out.
Those are valid complaints. I used the word "popular" because most people don't trust the experts on these kind of things.
Regarding the tubing, I've had bad luck with local hardware stores, and mcmaster.com is pretty cheap.
I doubt I fully understand the variables relating to the pump, but I was trying to shy people away from "700" gph pumps with 3' of head.
If I do another follow up article, I'll stop in here with a rough draft first.