I've made the most money with:
http://snrcash.com/
the bad: late at night in US time zones, theres not many girls online. prices are a bit higher than most other sites per minute, so makes some people go away i'm assuming.
the good: the girls are quite honestly the hottest, period. during the day, US time zones, you will make BANK if you have quality cam traffic. On my free sites, I mostly have general porn traffic or babe traffic, but I still have a 1:130 ratio with them and do quite well. They help pay rent and keep a couple local bars going well.
If you decide to promote em, feel free to gimme a shout on ICQ or e-mail - I'm good friends with the owner and I'll see about hooking you up if need be with custom content or what have you.