Spiller or Marshall?

[4th and Longwell]

I have CJ Spiller, Kevin Smith, Barber, Bradshaw, Brandon Marshall and Mike Williams.

I have already benched Williams and have Bradshaw and Smith benched right now... I was thinking about using Spiller's RB/WR position to run with 4 runningbacks this week.

I could go with Helu, Barber, Spiller, Smith/Bradshaw

or

Helu, Barber, Spiller, Marshall