For print products I'd say either Freedom City or Crooks! since both are pretty equal in my mind. If you want a good city setting with lots of cool extras, then Freedom City is for you. If you don't really want a setting, but need lots of great villains for light-hearted to gritty games, then Crooks! is a must buy. IMO, I'd get both.
For PDF products, LPJ Designs puts out some great templates and archetypes that can help newbies make the character that they want without having to pour over all the powers and feats. There is also one called Power Corrupted that expands the power base. Some of the powers are unbalanced, but it's nothing that a little houseruling can't fix.
Hope that helps,
Kane