I normally take my time and build proper bases that don't have to worry about ratios. I tend to make a starter base and then migrate to a monster where everything is on a 4-lane wide mainbus. That's four lanes per item. That way I won't have to wait for something that is bottlenecked by a single express belt of copper.

It takes a lot more time, but it makes for more organized bases, and it's the playstyle I prefer.

EDIT: Ducking autocorrect...