Going to set up a league among friends haven't really played, tried it once but, my question was what site does everyone use or suggest?

I'm not sure which ones to even look at the ones I've seen advertised most are CBS, yahoo, and ESPN, doesn't really need to have the most features and I prefer to not have to pay any fees just to avoid the case that the interest fades later on.

also any other info would be nice, just figured this would give me an excuse to watch other teams when the bears weren't on.