upgrading 1st place team

[big papi 06]

have been offered either andre johnson or dez bryant for steven jackson or ahmad bradshaw.
my team consist of:
qb= flacco
rb= a.foster, s. jackson, a bradhaw
wr= jennings,j.simpson
te=gronkowski
k=rackers
def= pit and nyj
bench:
s, moss, d. thomas, m. lewis, p. manning, c.palmer

i like the andre johnson for jackson trade the best since i improve my wr spot and stil have a good rb spot. what do u think?. also offered newton for jennings but that would make me weak at wr position