The problem is that Man City, Anzhi and Chelsea will have huge budgets for next season. And we know that United and Madrid also can invest high on these guys.
So, because of the competition, his price will probably be more than 40M...
To be realistic, if we sell Vucinic and Matri (let's say we get 25M for both) and spend 80M in both Suarez and Cavani, this would be good business... there are just a few world class forwards out there nowadays.
Also, Krasic, Elia, Melo, Bonucci, could give us a boost in terms of money...