Klaus, you are absolutely correct that we need options. I agree with you that Chamakh could be very impactful, particularly in the period until last November. I similarly see a role that Gervinho can play in giving us a bit of variety up front.
That said, if we are going to win trophies, we need match-winners. We need as many of the players as we possibly can on the team to be of the van Persie / Cesc level. Men who can be counted on to perform in games big and small.
I think that is an immediate priority. Someone noted that we could blow 40m on a star and then he's injured the next day. I don't advocate spending 40m (20 - 30 should do it), but we should not desist from buying a star out of fear they will get injured the first day. If they are healthy, they can have a bigger impact on our team than 3 or 4 mid-level quality players.