RE: pokemon booster box
Secret Wonders contains a lot of Trainers and Supporters that'll be desperately needed once the EX sets are phased out. Getting a box of Secret Wonders can certainly do you good in that department. Of course, opening booster packs has always been so unreliable for me in getting Trainers and Supporters, since I seem to get nothing but Night Maintenance, Potion, and Switch, and most of the packs from that set I open have nothing but Pokémon. (In fact, I average one Trainer/Supporter per prerelease.)
If you're getting Secret Wonders for the Trainers and Supporters, you're better off getting some theme decks, since they come with some good amounts of useful ones. If it's just that you feel like getting some cards you haven't seen much of, follow Ardoptres's advice and get a box from Legends Awakened.