AP and Reuters, I'd have to say.
The bias in FOX, Al-Jazerra, etc. is quite obvious. The bias in something like BBC or most European news sources is a bit more subtle. It tends to be located the degree of coverage various things recieve, not in editorial coloring. For instance, they do not outright say "America is evil" in their coverage, but they tend to give a disproportinate amount of coverage to things that make the United States look bad.
AP and Reuters, because they sell news to all over the world, seem to be the best.