I would much rather have a quick, mobile striker in a 4-3-3 than a big target man. As Dresden said, someone who can drop deep, look for the ball and bring the wide men into play.
The signing of Cabaye is a fantastic one as, with Tiote linking defensive and midfield, Cabaye is very much an energetic ball player who will look to make late runs into the box, always a good trait in a midfielder.