Figuring out how much injury liability coverage you actually need

I was trying to sort out my car insurance policy yesterday and got stuck on the bodily injury liability part. After some googling and a chat with my agent, I think I got it down: first, check your state's minimum requirements, then consider your assets and income (you know, to protect yourself from lawsuits), and finally, weigh the cost difference between coverage levels. But um, does anyone else have a simpler way to figure this out or maybe some tips I missed?