I have been offered his Knowshon Moreno and either Calvin Johnson or Braden Marshall for my Andre Johnson and Donald Brown.
As you can see from my team below, I can use the upgrade at RB and can afford the downgrade at WR.
QB - T. Romo
RB - R. Mendenhall, D. Williams, M. Lynch, B. Tate, R. Helu
WR - C. Johnson, R. Wayne, Julio Jones, D. Amendola, J. Know, H. Ward
TE - J. Witten
K - None yet
DST - Baltimore