Yup, that's the same 5 I'd use, too.
My Super Bowl lineup decisions:
Minnesota DST (at Chicago) or Arizona DST (vs. St. Louis)
Which 2?: MJD, Cedric Benson, Jonathan Stewart. I've gone with MJD and Benson almost every week, and I like their matchups this week, but I'm still waiting to hear DeAngelo Williams status for this week. If he's out, it'd be tough to sit Stewart.
Which one to start with Miles Austin?: Chad Ochocinco or Steve Smith (CAR)? Ochocinco goes against KC, but in the 3 weeks since Delhomme has been out and Matt Moore in at QB for Carolina, Smith has 14 catches for 318 yards and 2 TDs.
Minnesota DST easily. Arizona's D is pretty MEH, and if Cutler isn't busy getting sacked by the Vikings SICK D-Line, he'll be throwing picks.
MJD/Benson but like you said, if D-Will won't play, start Stewart over Benson. Besides, Cincy was talking about playing Larry Johnson some since they are playing against KC.
Go with the hot hand if Delhomme is out. Steve Smith. Otherwise, Ocho Cinco.