The 433 really seems to be the best formation to play in the MLS considering the play style. But Wingers & Great Finishing Target Men (Ex; Drogba sort of player) don't fall out of trees.
Can play a offensive 4-3-3, With a CAM, & 2x CM. But lets be honnest, Di Vaio isn't your ideal target man, although he could do the job. Arnaud & Mapp don't have the pace to burn and annoy defenders, or even deliver quality crosses