All of the usual's are pretty good....CBS, ESPN etc. I have tried CDM Sports for Roto and got my arse handed to me...lol Just depends on what you are looking for...active owners, trades...etc? CBS pays $600 to the league champ for a $99 fee
Most of the really good non mainstream ones are already done drafting so you have to go with one of the main hubs. CBS has the biggest payouts but I hate their layout.