I was thinking Fernando Torres, or potentially Klass-Jan Huntelaar, but he would be cup tied for Europe, and I don't think Alteltico are keen to sell, especially after off loading Mateja Kezman to Fenerbahche (probably now go and score about 30 plus goals, knowing his habit of bulling weaker teams in leagues of lower standards), esepcially not Torres. I'm not sure if the will buy Jose Antonio Reyes from Arsenal.
There is Carlos Tevez, but unless a fee is sorted very quickly, contract is agreed, United may not get a WP in time.
As for Arsenal, it looks like Cole or Gallas aren't going anywhere, but that could change. A good thing for SP's team, that Middlesborough have signed Jonathan Woodgate on loan from from Real Madrid, pending a successfull medical.