selling trezeguet and bringing in cassano isnt all that stupid.
you could play 2 positions upfront :
1.zlatan as the supporting forward,and cassano as the one as the finisher
u cud play zlatan-cassano upfront.and cassano is a much better finisher than a lot of people give him credit for.he's pretty much got the same finishing abilities as del piero had at his peak.true,cassano is no trezgoal when it comes to goal,but he can score a decent share of goals.
2.u cud play both of them in convential fwd positions.the problem with zlatan is that he is the one who needs to feed trezl the goals,which is a decent enough reason for zlatan to not score so many goals.so if u had a player upfront like cassano who could both provide zlatan with finishing passes and score goals himself,then zlatan-cassano could b a very good partnership.cassano might just be the player who gets zlatan his goals on a regular basis,in other words - the perfect foil for zlatan.
and even if u dont bring in cassano,u could always get another lethal finisher for 30 millions.van persie would be a great option.he wont cost too much,and the rest of the money could be used on other departments of the team like nedved's replacement.