BBC is widely considered to be among the best:
http://news.bbc.co.uk/
I tend to think the AP is probably not particularly biased:
http://www.ap.org/
But you'd find plenty of people who'd disagree with either.
Personally, I think bias is at once under- and over-played. I forget the source, but there was a study performed where people on two sides of a controversial issue (in this case, the Israeli-Palestinian conflict) watched coverage of it. Both were absolutely convinced it was biased to the other side. The more they knew about or cared about the issue, the more biased they thought it was against them.
Nevertheless, any single medium IS going to contain some bias, simply because news is reported by people, and decisions have to be made. The best thing to do is to read, watch, and listen to as many sources as you have time for - you'll be better-informed than you could be from any single source.
PS: The plural is biases, not bias's - the apostrophe would indicate that your bias possesses something.