I'm trying to download myself out of the habit, but I still play DA.
As everyone else said, get up to 20 billion pop max, a morale building or two, the rest stock markets.
But me being the power-hungry oppressionist that I am (in the game), I research up to Advanced Farming, Virtual Reality Centers, and Stock Markets. If I find a PQ 26 or higher, I will place 10 advanced farms (100 billion pop cap), if I'm feeling generous, I'll throw in a few entertainment buildings to keep the masses happier. And the rest Stock markets. I usually have to put at least 7 VR Centers to keep them at 70% happiness (by then I have alot of morale resources, I go for them quick as hell on gigantic maps). From that one planet I am usually able to cash in 500K BC's per turn (I go for the Econ resources faster than I go for morale). Go to my "All Economy Strategy" post, it gives you a more in-depth look at my gaming style. The post is sortof long though, so I suggest that you have at least 5-15 minuites of spare time to read it (depending on how fast you read, for me it takes 5 minuites).
Hope this gives you something to ponder.
Till next time.........
LET'S RAGE!!!!!