Doesn't matter what network they work for. Who do you enjoy listening to? Who drives you insane?
For analysis, I actually think Trent Dilfer is tough to beat. Always very thorough, generally impartial, and very very smart. Eric Mangini is also very good when he's a guest on ESPN radio. I also like Shannon Sharpe and, surprisingly, Deion Sanders, though for those two it's more about their personality than anything.
I like a number of commentators well enough, but Phil Simms makes me crazy.
As for writers, I don't think there's anyone better in the business than Peter King. His MMQB column is great, and I really like his takes on things.