The ideal would be to change the 3 guys upfront. I'd like to see Vucinic out of the starting XI, he was very annoying during most of season.
But let's be realistic.
RVP is probably going to City/Chelsea/Madrid/Barcelona.
Suarez is by far the best player in Liverpool and they would only release him if he officially demands a trade and some team offers at least 35/40M for him. It's highly unlikely.
Cavani is very very expensive and Napoli won't make another Italian team stronger. I really doubt he'll leave for another Italian club. I'd love him but it's really hard.
Higuain is also nearly impossible. He plays for the most famous and richest team of the world, and if he requests a trade (what I doubt) he'll probably leave to Premier League.
Dzeko, on the other hand, has world class upside and is a realistic target. He should face competition from Bayern, but I think for something around 25M he could come, it would be a huge improvement.
Jovetic would be very interesting as well. He won't be cheap, but he's also a realistic target.
Giovinco IMO won't make it at Juve... we should sell our half for 12/15M.
Oh, and Kolarov is HIGHLY overrated. This guy is a defensive disaster, very weak mentally. I'd rather have Adriano, for 8/10M.
Isla would replace Pepe perfectly. He's an improved Pepe.
So, for me a decent mercato:
Coming:
Leali (4M), Adriano (8M), Caceres (8M), Astori (10M), Pogba (free), Verratti (12M and loaned), Asamoah (15M), Isla (14M), Jovetic (18M), Dzeko (25M) = 114M spent
Leaving: Manninger (free), Ziegler (3M), Motta (2M), Grosso (free), Pazienza (2M), Melo (12M), Krasic (7M), Elia (7M), Estigarribia (free), Jorge Martinez (free/loan), Giovinco (12M), Borriello (free), Iaquinta (free), ADP = revenue of 47M
Total: around 68M spent. Do we have this money?
The squad would be:
Buffon, Storari, Leali
De Ceglie, Adriano, Litchsteiner, Caceres
Chiellini, Barzagli, Bonucci, Astori
Asamoah, Marrone, Marchisio, Pirlo, Vidal, Padoin
Isla, Pepe
Jovetic, Vucinic, Quagliarella
Dzeko, Matri