Which flex to go with?

[FattyMcButterPants]

Cant decide which flex to roll with this week.... help me out!

I've bolded my potential starters.

ESPN Standard Scoring
2RB, 1RB/WR

RB's: Kevin Smith @ MIN,Chris Johnson @ BUF, Ladelle Betts vs. DEN, Darren Mcfadden vs. KC, Knowshon Moreno @ WAS
WR's: Nate Burleson @ ARI, Devery Henderson @ STL, Malcolm Floyd vs PHI, Mike Wallace vs. CIN

Thanks! WHIR just leave a link