I just started playing regent, and I had to drasticlly change my strat. I probably don't have the perfect strat., yet I never have money problems, nor do I fall behind in tech.
Here is what I do:
1. Research = 0, really though, just enough so that I still have a time that the tech will come out displayed on the screen.
2. Lux. = 10-30 depending on if I am at war or just want WLTKD's.
3. Trade, trade, trade...
That's it... It tends to work. Also, when you attack, be sure to grease the palms of your neighbors you aren't attacking, or better yet have them help.