I'm thinking of buying an inexpensive product line with 120mm, 140mm, 240mm, 280mm, 360mm AND 420mm AIOs. What product line isn't that expensive, has a strong pump (I don't care about the fans since I'll just swap them out if they're weak), and comes in all of those sizes? If it doesn't have all of them, what product line comes the closest to having the full range?
Alternatively, if I were to build all of them myself, what's the best place to buy the parts cheaply with good quality, if not great? They would have to be identical in every way possible, and mimic pre-built AIOs, so no extras like VRM fan, reservoir, waterflow meter, etc. - fans aren't a concern as I have hundreds. No LEDs as I've discovered that light moves so much faster than water that water actually (not) slows down in their presence!