For my $$, it's who will have the best overall record. You can get Carolina (15-1 last year) at +800, for example. In addition to that, my top values here are:
• Cardinals +1100
• Bengals +1400
• Giants +3300*
• Redskins +6600*
*It's very telling that the Giants are double the price at an outrageous +6600, but if the NFC East is indeed super-crappy, and one of those teams runs away with it, then they have a chance at top overall record.