"It is true that if I'm going to watch a news channel, it's likely to be Fox..." - One could never tell. If you REALLY want both sides to a story, watch Jim Lehrer's New Hour on PBS - 7:00pm Eastern. If not, stick w/FOX - they won't challenge your thinking, just give you sound bites from the WH.
I'd shy away from fox news as they have the most ignorant viewers along with Rush listeners. For people who primarily get their news from those sources when polled about understanding current news they always faired the lowest on people who knew the facts along with people who watch the daytime soaps.
People who listen to PBS and watch the Daily showed scored the highest along with people who got their news primarily from newspapers.