You don't need the orbital units too much. The most useful one is probably the Solar Collector. The +1 food one isn't bad but it's just not that useful to go out of your way for it, unless you wanted to get the Supremacy affinity from that tech anyway. Holomatrix is pretty poor. Magrails are a better reason to get the tech Holomatrix is on, but not quite worth going out of the way for unless you again wanted to get the Purity affinity from it anyway.
The main way I'd suggest navigating the web is going for techs that give the affinity you want most. Also somewhat prioritizing the techs that allow you to improve the resource relevant to your affinity's units and buildings. Terraforming is a good tech to get somewhat early if you're going for purity, for example, so you can get floatstone. (and assuming you actually have some floatstone around to even improve)
Always start with pioneering (pretty obvious I guess) and then get the techs that reveal titanium and petroleum. If you take Electromagnetic Scanner to reveal titanium, geothermal and petroleum on the map from the start, you should go Pioneering > Chemistry so you can get the research labs and recyclers. If you don't pick the scanner, I like to get the titanium tech first after pioneering instead, since revealing titanium that might be near you will get your production boost from it started faster, then Chemistry after for the labs and stuff again.
The rest of the early techs you can just take what seems best for your situation. You should probably go for the spy agency tech after the rest of the early inner ring techs to get spies rolling earlier, or delay it for some affinity techs if you're threatened by AI. For the most part you then branch off towards what will give you the affinity you want. Don't worry about being too strict with an order unless you're trying for some fast win times. As far as just securing a win, you have room to be looser with what you tech towards and making detours to non-essential things that might make life a bit easier, even if a more optimal game might skip them for speed.