With CL:
Shift Ade, seeing as we'd have to pay him far more than we do anyone else. Also Saha.
Lavezzi and Ba would be my two picks, Lavezzi for his versatility and phenomenal skill and Ba because we'll need a battering ram. If we want a full-blown revolution, try getting Pandev in as well.
Alternatively, Stevan Jovetic should be eminently gettable, seeing as Fiorentina are fairly low in the table. Though we'll need a battering ram anyway, he can play cross the front three plus up front on his own, so decent cover there. Much like Lavezzi.
Go into the season with Lavezzi/Jovetic, Ba and Defoe as forwards; look forward to lifting the CL trophy come May 2013.
Without CL:
Shift Ade anyway cause we can't keep him, and Saha because...well, he's Saha. Try to get Diego Milito in because he's old and Inter likely wouldn't want him, and Mario Mandzukic from stagnating Wolfsburg. Hope for better days as we go into the season with Madzukic, Milito and Defoe as our forwards.