PICK 2...barber, marshall. a.brown, spiller

[Ahzzy]

Pick 2 to start for my semi-finals
Marion Barber, Brandon Marshall, Antonio Brown, CJ Spiller.

I usually take RB over WR for a flex but both Barber and Spiller do not have favorable matchups. I also dont know how much Big Ben's health will impact Antonio Browns performance. Right now I'm leaning towards Marshall and Brown, what are your thoughts?