This whole thing was analyzed in an earlier thread, and it's playing out pretty much as suspected.
Giants at Ravens would be a great choice, but it's been protected, as we suspected. Bengals at Steelers is a decent choice, given that whoever loses is almost certainly not going to make the playoffs, but that's protected too (and has more of a regional appeal, anyway, with no big market teams).
If it's not us, it'll be Saints at Cowboys, because of the market size and the fact the 49ers play on the previous Sunday night. This of course assumes at least one team, ideally both, are still alive.
(Maybe Vikings at Texans?)
My understanding is that this will all be settled Tuesday the 11th, as they must provide essentially two weeks notice to all teams involved.
Seems to me that if I was making the decision, I'd rather have two teams that were playing for playoff positioning, than one team that was playing to keep from being eliminated and another team that was pretty much out of it... the first type of game is likely to have people watching for 3+ hours, the second type of game could easily be a blowout with people tuning out after 90 minutes...