I'd go with Welker / Nelson until 1) AJ proves he's back to being AJ and 2) Decker proves the preseason love affair with Peyton is more than a preseason week 3 fling. Of the four WRs I mentioned, I probably rate Johnson the lowest since even his best seasons aren't all that great when you compare them to the ceilings of the other 3. He's in decline.
QB Brees, Wilson
RB Morris, Moreno, Redman, Powell, C. Michael, K. Hunter, K. Davis
WR White, V. Jackson, T. Smith, J. Jones, M. Austin
TE M. Bennett, T. Eifert
Matchup DST / K