Vucinic for under 20 m? Yes, get him! Rather we spend 20 m on a quality player like him capable of performing against big sides and in the Champions League, and invest more into midfield and defence.
Q, Matri, Vucinic, Del Piero + 1 is a good and creative attack that can take us to the top three, assuming we don't concede too many stupid goals and our midfield gels quickly.