At least you admit it.
Corn, wheat and soybeans are the big three. That's where the money and the moves are.
I'm presuming you know what the e-mini volumes are already. You can go to the CBOT website and check the ag volumes at your leisure. Or just fire up Tradestation and look at the volume for all three on the Daily charts.
Best time to trade is RTH for the pit...trade the electronic during that time: 9:30a-1:15p CT (10:30a-2:15p ET)