I do quite a lot of Agricola drafting, and one thing I've been noticing is that just taking the most powerful Occupations each pick is often not enough - finding synergies is usually better. To give an example, I'm just finishing a game where I took Mason, Architect and Wooden Strongbox inside of the first three picks: individually none of these would be considered especially strong, but as a team they allowed me to pull forward to an unbeatable lead in the late game.
I could give lots more examples of obviously good combos I have seen or managed to draft myself (Bricklayer/Clay Plasterer? Well Builder/Village Well/Water Carrier/Flagon? Renovator/Manservant/Plough Driver?) but what are the strongest combinations that a top player should always be on the lookout for from the moment they sit down to an Agricola draft?