Do not think we should\will sign a striker in January.
Even if we signed someone early in Jan, they would be able to play in the Everton game on Jan 10th at the earliest.
By then Jovetic and maybe Dzeko should be fit again.
The best option, if we did go for striker, I think is Bony, but he would then not play for use until after the ACON (mid Feb), by which time Aguero will\should also be fit, and Swansea would want silly money most likely, especially in mid season if they felt they themselves did not have enough time to sign a replacement.
Thus for the next 3 games we simply need to either use Pozo or another striker from the EDS or simply have a midfield 6 in effect of say:
Fernando Fernandinho
Milner or Navas Toure or Lampard Silva Nasri
With Toure\Lampard and Silva given license to push forward