Now, examples of this kind of player:
Lewandowski (haven't seem him play much, but his numbers are great, he's young and shouldn't cost more than 20M)
Juan Iturbe (Porto - young Argentinian with huge potential)
James Rodriguez (Porto)
Nicolas Gaitan (Benfica)
Jovetic
Wijnauldum (PSV)
Mertens (PSV)
Papadopoulos (Schalke)
Draxler (Schalke)
Dybala (Palermo - bought for 9M - played in Argentinian 2nd division - very promising player)
Ocampos (just bought by Monaco)
Vietto (Racing)
And the list goes on... but I think this is the kind of player Juve has to look for. A player who will develop along with the club. We must have smart scouting now, more than anything else.