I don't believe we'll sign Diamanti. In any case, the massive difference between signing Tevez and Diamanti would be the wages, Tevez would get at least twice or thrice Diamanti's wages.
Tuttosport: L'agente di Tevez rivela: «Juve? Grandi possibilità»
http://www.tuttosport.com/calcio/calciomercato/2011/11/25-156739/L%27agente+di+Tevez+rivela%3A+%C2%ABJuve%3F+Grandi+possibilit%C3%A0%C2%BB