At first sight, Robinho seems the best (or easiest) option, yes. Afaik Robinho is training with ManCity for the moment, but he hasn't been in the squad yet this season? According to his wikipedia-page, he'd like to move to Spain/Italy before the end of the transfer-window.I think that if Ibra leaves,we will sign Robinho on loan,no big strikers
He's a major gamble though; so if we go for him, I prefer to take him on loan, and not sign him permanently immediately.
I hope we don't go for Adebayor though, one of the football-players I despise most.