I have played the demo for the past few weeks and have finally purchased the game.
I played a short game last night 3 hours
I find that I really don't know which research topics are necessities. I was picking topics that sounded useful without an overall strategy behind my choices. Not to mention I researched all of the Terran upgrades before I realized that my home planet was Desert, Doh!
So, which research topics are the most useful and are high priority?