So we got 3 targets, Suarez, Cavani and Higuain. All in the same age bracket.
Higuain- a top goal scorer for the club side, with 22 goals in 35 games. Very lethal, especially when you consider his number of shots are just 60 shots. His strength is within the box. He isn't going to create a magic out of nothing. However, his stats in Europe isn't very good. Just 3 goals out of 12 appearance. Being second fiddle to Benzema , partly could be the reason as well, or everyone scores easily in La Liga. Take Forlan for example, top goal scorer in La Liga and where is he now with Inter? He would probably demand the highest wage among all 3.
Suarez - Liverpool's best players. 11 goals out of 31 appearance with 128 shots. But he has been playing in probably the worst Liverpool team in a decade. And with players like Downing suppose to provide the assist to him, he have everything on himself. He isn't really the top goal scorer that we might be looking for. However his work rate and mobility could be a factor. Wage demand could be slightly less than Higuain.
Cavani - According to most , he is Conte's choice. 23 goals out of 35 games is very impressive. Not as lethal as Higuain though, as he made 124 shots. But his stats in Europe is better than Higuain's, 5 goals in 8 games. He isn't just in the box player like Higuain. He can score from outside the box as well. Has fantastic work rate. He comes within the league and has the least risk among all 3 players. But some argue, he been playing well only after being the focal point in Napoli and and he isn't the same player he was when in Palermo. Well the same can be said of Higuain as well. Even Henry, when changed to a more central figure in Arsenal is extremely well. Most likely his wage demand isn't going to be as high as the rest, but surely his transfer fee will be the most expensive among all 3.
I think at the end of the day, when Marotta going to seal the deal, he will surely get the player with least risk for the millions he paying. We are not talking about thousand, but millions. And when you decide to invest that much, the risk factor will be the biggest consideration.