Recommendation for full service broker for friend

A colleague of mine asked me and since I am pretty much have been only on a self directed model although with some quality introducing brokers, i do not know how to answer.

I asked him what he wants and he mentioned commodity (mainly agriculture futures, spreads and options) and this is not really anything much i did research into.
Also he would like a large FCM to back the full service broker like RJ O brien or Advantage or ADM etc

I know most here are self directed traders but maybe some might have accounts with good full service brokers and i could pass on that recommendation - thanks