Got to be Chelsea or City hasn't it? He seems dead keen to get back to the premiership and he's already done Italy and Spain. If he wants the United job when Fergie packs up I don't think he can take the City job though.
The Chelsea fans would love him back, think he'd love to go back as there's unfinished business (winning a CL with them), the job is available in the summer so everything is in place for it to happen just will Abramovich and him mend their relationship?
Be surprised if he ends up at PSG Ancelotti has done a decent job for his first season, they ran Barca to the wire.