Arsenal Spot

Which player is a must buy for arsenal during this window?

How about  Lucio  of  Bayern Munich as centre back . 

Actually I dont think their are any ''must buys'', only reinforcements could be welcome, just like the rumours first of Barnetta, Lescott ( also Upson, but I dont prefer him ) and probobly more. Anyway Afellay, Appiah, Kompany ( btw Kompany -unfortunate- would be a high price tag, so that is going to be a low chance )  would also be considerations...or not?

And I think Arsenal is still missing a beast on midfield ( altough Diaby and Song are growing into it, and Denilson is getting more skillfull everyday )

I've been fond of the Lorik Cana of OM rumor ever since I heard it about a year or so ago. However, since then I've become much more confident in our midfield...besides I'll start feeling bad for Marseille having already gotten Nasri and Flamini from them within the past five years.

He might be an interesting option though...

Well there were rumors going around about arsenal splashing 20m on higuain(Real Madrid Striker) which i think would be a bad waste because arsenal have gotten emmanuel adebayor to start heading to last seasons form, van persie looking pretty good, andrey arshavin is already excellent, Skillful Eduardo, and improving bendtner. The only person we need to replace is denilson, because he is playing really terrible, like not covering his man, or running to defence to help

Its obvious that we don't need a striker.  I would go for centreback Brede Hangeland (sp) or Mamma Sakho of Psg. If possible we should sign Mammadou Diarra (since he's coming back from a long term injury and now they have a new cdm in Lass Diarra) Hopefully, Wenger has learned that signing an experienced player bolsters the team.