I try to pick a planet farthest from the other races that is suitable for my "trade" planet. I put a lot of economy upgrades on that planet then build all of my freighters there. In my most recent game I have four economy starbases around my trade planet. How many do you usually put? Is there an effective limit to how many you can put around that planet? I also look for places where multiple trade routes intersect and put an eco-base or two there also. My understanding is that you can get an economic boost using this method also. Anyone else want to share their tactics?