I don't think we could get Gameiro, Gervinho and N'Zogbia altogether, very likely just two of them. Gervinho and N'Zogbia are probably mutually exclusive as we don't need so many wide players (Jonas, Ben Arfa and Ferguson).
In case we couldn't get Gameiro, we should go for Wickham as our backup. I think you'd agree with this.
Defensive holes need plugging? I'm not that worried for Enrique's situation. We either tie him up or use his proceeds to buy M'Bengue. Simpson is doing fine and no need to be replaced at this moment.