Bianchi is not really the poacher that Gilardino is, but he's a better target man and more involved in the game. That's actually a good thing IMO, since we all see what happens when box players such as Trezeguet and Gilardino have difficulties finding the goal - they become pretty worthless. Bianchi would still offer us something even if he doesn't score 20+ goals a season.
For the same reasons, I'm not too eager to see Huntelaar join us. I'd rather see strikers such as Suazo, Amauri, Berbatov, Anelka or Kanouté (and Bianchi, of course) with us. Forwards who can create for others and themselves.
I have seen Mesto play plenty of times now, and he reminds me a lot of a right footed Balzaretti. Good in attack and comfortable on the ball, but tends to get caught out of position. Not sure if I see the point though since we have Salihamdzic.