Of course every team of the world would love to have Van Persie. But at what cost?
I've read that it should be around 30M. Which is too much for a player nearing the 30s, with a history of injuries and whose contract will finish in 1 yr.
For 25M, at most, it would be worthwhile. But let's not forget that he averages around 25 league games per season in Arsenal - that's not a lot. And Juve isn't the best place for injury-prone players.
My point is: if Juve is willing to offer 25M for RVP, maybe first we could try 30M + Matri for Cavani. 35M + Matri would also be worthwhile, taking into account Cavani's age and good health. Even 40M should be considered. Juve would be buying not only the present, but the future all along. RVP is in his peak form and should have more 2 or 3 WC years ahead of him, while Cavani should have 6 or 7.
Anyway, if Cavani is not available, and we know Higuain isn't, then we should go for 25M RVP. And I think our chance of getting him is really big.