Calvin johnson for arian foster should i do it?

12 team league 1qb 2Rb 3Wr 1TE 1K 1D

matt ryan, felix jones, Shonne greene, tim hightower,marshawn lynch, kendall hunter, ryan torain.....Roddy white..Dez Bryant...calvin Johnson...crabtree....jimmy graham and i have janikowski and matchup D....Should i make the trade? The way my bye weeks line up i have to drop 2 runningbacks next week

Hmm thats a tough one. If you do it, you should look to then upgrade that WR position by trading a shonne green or felix jones + R white or Dez for a better reciever