I have a free subscription to the Huddle Report, because I write for them. I don't think there's a better bargain out there than that site. THR's subscription is $9.95 for the year, while most other sites are at least $20. I don't think you can beat that deal. It may not be the best, but I think it's one of the best.This is a good resource to see who has had some of the more "accurate" drafts in recent years
I do like Boomer's site which is now called West Coast Draft Services because it provides a thorough breakdown of a lot of players.
And although I'm not a fan of Kiper, he is on his game. Personally, I think he puts a little too much emphasis on workouts and numbers rather than on-field ability, but I guess so many NFL scouts/GMs do the same.