Flex Help! Blount, Stevie, Tate, Foster? Also DEF

[smac1009]

Need some advice for flex and D/ST, standard scorning non-PPR. Here's my roster:

QB: Fitzpatrick
RB: Ray Rice
RB: Ryan Mathews
Flex: ???
WR: Roddy White
WR: Mike Wallace
TE: Owen Daniels
D/ST: ???

Bench:
QB: Freeman
RB: Blount, Foster, Tate, Tolbert
WR: Steve Johnson, Malcolm Floyd
TE: Gonzalez

I can plug in a RB or WR at flex, and so I'm torn between Blount and Steve Johnson. Or would Tate/Foster be a better option? I want to stay away from Foster until he produces (burned me in week 2).

Also for DEF: NYG, TB, or TEN? All available on the WW.

THANKS AND WHIR!!!!