Juve has to replace not one but two players; Del Piero and Nedved. Aguero is quite proven, (i wasnt expecting him to score as many as he is now) he has played a lot of games in Argentina and now he is in his second season at Athletico Madrid. He has definately played more games than Giovinco so at the moment Giovinco is the unproven one (free or not). I also hope that Palladino becomes a Juve great but I expect him to fill Trezequet's boots not DP or Neddy's. Juve needs some penetration in the attack and sooner or later money has to be splashed, it better be when the players are available. I hope its next summer(Quaresma or Aquero) cause thats when competition will be least as Real and Barca have full roosters.
On the basis of filling trez' boots, you see Palladino as a box striker rather than a supportive striker? Not sure how others see this but i feel Palladino is more of a supportive player...eg. del piero/iaquinta type.
As for replacing Nedved, it depends what Ranieri wants. If he is going to use a 4-3-3 then Nedved is basically replaced already with the likes of Iaquinta, Palladino and possibly Giovinco if he proves himself and becomes what we are all hoping for.
If Ranieri is wanting a 4-4-2, then yes, then definitely we need a replacement on that left side. Quaresma is unrealistic, barca, united, chelsea, Real, inter, milan, liverpool...will all be ahead of Juve for this. but the smarter decision will be to source somewhere else. Rosina would be a smart buy for example.
The other aspect of it all is buying a true playmaker. but then again, it depends on what ranieri has in mind.
For me, if Juve could keep Palladino, get Giovinco back and buy Rosina, that would be better for the building of the team than spending huge amounts of cash on one player, as im sure the big teams will be after Aguero. Then we could spend the money else where like in defence.