Corn or both silage & Grain.  Most is silage.  I shoot for grain , sometimes few less $$$ gross, but harvest cost is 1/3 of silage & I plow the fodder down.  Silage is EXPENSIVE to harvest & haul.  25-30T silage , 175-250 BPA .  We are in a corn deficit area & normally I get $.25-.50 over Chicago after harvest.  Some earlage harvested also.