I'm playing the 4-2-3-1 Asymmetric formation at the minute - set it to 'Fluid' 'Attacking' and watch the beautiful football unfold.
Also I recommend buying a player such as Raul Meireles or Tiago for the CM role, there is a lot of space in the middle with this formation so there's a good chance you could get 1 or 2 goals a game from them.