I used to get fantasy football mastermind, but now they are no better than 3rd.
The top 2 IMO are www.Footballguys.com
You can't go wrong with either.
Both have lots of great info.
Its a toss-up as to which one is the best.
footballguys gives you free daily emails until the start of the season, even if you are not a subscriber.
I got both last year and I placed top 3 in all 3 of my leagues last year.