I would love to see Matt Forte in the black and gold. He's a great runner but he is electric when catching the ball out of the backfield. Seems like we have been missing this elemnt from our offensive backfield for a looong time.
Even more than Forte though I have to say Carl Nicks. O-line is boring I know but ever since Faneca got old and we had to let him walk our guard play has been subpar at best. Nicks can maul in the run game and has been a major factor in keeping Drew Brees relatively clean.
I do think Foster has been the best back in the league for a couple years now (and stats back it: most yards from scrimmage and TDs for any RB/WR over past two seasons) but he has been playing behind one of the best o-lines. Forte made a ton of plays last season despite playing behind a line as bad, or dare I say worse than ours.