Who to Start Message Board

This is my current roster. Should I pick someone up or make a change?

STARTERS
QB Tim Tebow
WR Wes Welker
WR Percy Harvin
RB Michael Bush
RB Willis McGahee
W/R Kevin Smith
TE Jason Witten
K David Akers
D Seattle

BENCH
QB Matt Moore
WR Antonio Brown
WR Andre Johnson
RB Beanie Wells
RB Marion Barber
K David Akers
D Chicago

Notable Free Agents
WR Malcom Floyd
WR Santana Moss
RB Mike Tolbert
WR Demaryius Thomas
WR Pierre Garcon
DEF Detroit
WR All Oakland WRs
QB Matt Moore
QB Andy Dalton