You won't really wrong with any combination, unless you sit Johnson (haha). Decker and Manning have built quite the relationship though, and I have been off the Beanie Wells train for a long time. He is just a mid-to-low tier back. If you look at Decker's preseason stats and rapport with Manning, you might change your opinion. Hope this helps.
10 team 1 QB, 2 RB, 3 WR, 1 TE, 1 K, 1 DEF P Manning, RG3 A Foster, CJ Spiller, B Tate, Le'Veon Bell, D Thomas, J Nelson, M Wallace, DeAndre Hopkins, Vincent Brown, Marlon Brown J Thomas, M Bennett Prater Ravens