Play the smart hand and avoid the WR. Play the two RB's.
BJE has been very good in the second half of the year. This might be a grind-it-out game, and Green-Ellis will get the touches if that's the case. The Steelers are good against the run, but Dalton has been too inconsistent to put the entire game on his arm; likewise, Law Firn has been too good to ignore.
Stevan Jackson is starting (as you know), and even against the top-ranked run defense in the NFL you have to start him. There are two reasons: he had a 146 yard games last week, and because your alternative is...
Lance Moore: Drew Brees spread the ball to nine different pass-catchers last Sunday. Moore had only 5 targets and 4 catches. Sure, one of them was a 7yd TD, but that's not fantasy production you can bank on. He'll likely catch 4 or 5 balls up the seem for about what I would wager will be around 85 yards. If you think that will outpace Jackson's production, start him. But keep in mind the last time Jackson's production was that low was week 8.
If I am you, I start the two workhorse RB's and forget about it. All the best!
RB: Martin / Lynch / Lacy / Ridley / Wilson / Michael
WR: A Johnson / VJax / Gordon /Ja. Jones / Nicks / Douglas
PK: Bailey; DST: KC