I think the best three players we can sign are Aguero, Benzema or Higuain. Here are their goal scoring stats:
Sergio Leonel Aguero del Castillo
Age: 23
Height: 172cm
(Independiente) 23 goals in 54 games [a goal every 2.35 games]
(Atletico) 82 goals in 195 games [a goal every 2.38 games]
(EuropaLg/ChampionsLg) 20 goals in 39 games [a goal every 1.92 games]
(Argentina) 11 goals in 27 games [a goal every 2.4 games]
(Career) 136 goals in 315 games [a goal every 2.32 games].
He's short-ish, fairly quick, works hard, not great in the air, fairly strong (but not particularly for someone who may play as a lone central striker), he's skillful, is a good passer, he plays well in big games against big teams often scoring goals in these kind of games.
Karim Benzema
Age: 23
Height: 184cm
(Lyon) 54 goals in 131 games [a goal every 2.43 games]
(Real) 28 goals in 68 games [a goal every 2.43 games]
(Europe - remember this is ALL in the CL!) 19 goals in 32 games [a goal every 1.68 games]
(France) 12 goals in 37 games [a goal every 3.08 games]
(Career) 113 goals in 268 games [a goal every 2.37 games].
He's taller, stronger, just as fast, holds the ball up better so will suit being a lone no.9 if he has to play like that, has much more CL experience, has scored goals against big teams from all over in the CL, i think his size and strength will suit the Prem better than Kun.
Gonzalo Higuain
Age: 23
Height: 184
(River Plate) 16 goals in 40 games [a goal every 2.5 games]
(Real) 72 goals in 138 games [a goal every 1.92 games]
(Europe - all CL!) 4 goals in 27 games [a goal every 6.75 games]
(Argentina) 7 goals in 14 games [a goal every 2.00 games]
(Career) 99 goals in 219 games [a goal every 2.21 games].
Not as quick as either of the others but i reckon his all round play is better than both Kun or Benzema's. His size and strength would suit the Prem and his finishing is sublime although his CL goals are quite poor!
I think i would go for Benzema!