Definitely. Going to CL next season will both improve our economy and attractiveness towards high quality players. Furthermore, the economic boost of the new stadium will be felt by the end of this season (not saying that is has payed off, but a much improved steady flow of cash throughout 10 months will be noticable)
Attack: Tevez, Higuan or Benzema
Midfield: I wouldn't use any money here, just welcome Melo home from Turkey and there is your further depth in both quantity and quality we need for competing in CL.
Defense: Tremoulinas/Cissokho for LB & Rhodolfo for CB
This should be do-able with 50m, which we will have at our disposal next summer.
My dream lineup next season, within the confines of realism:
Licht - Rhodolfo - Chiellini - Cissokho
Vidal - Pirlo - Marchisio
Tevez - Matri - Vucinic
If we have the same amount to splash as we did this summer, aprox 90m I'd like this:
Licht - Rhodolfo - Chiellini - Cissokho
Vidal - Pirlo - Marchisio
Tevez - Higuain - Vucinic
FAPFAPFAPFAPFAPFAP