Early Research Paths
Obviously we're talking about the more normal research paths and not the weird ones like the Thalans.
I consider ion drives and planetary improvements to be super-important. Ion drives means all your engines costs 10 bcs less, which is fabulous for the early colony ships, and planetary improvements provide those huge bonuses to everything.
After that if there's tech trading you probably want xeno communications and universal translator.
But then what? Let's say you're using super-breeder so you don't need recruitment centers. What is the next good tech path? Is it still worth it to get space militarization for the military bonus?
I normally just go down the planetary governments route afterwards for the diplo and econ bonuses, which will kick in when I run out of money. I might add a small detour for a morale tech or two to help the population grow. But is there a better route?
EDIT: Central mines. Wow. They provide the production of two early factories and cost only 3 bcs in maintenance. Cheap to build too.