my favourite to go for at the start are Scholar and banker, for unlimited item identification and extra gold. later on, when I get to freehaven I grab a gatemaster. I always grab the same one, in a house next to the temple I believe and then ditch the scholar. an instructor is also good, you get more xp. when I go to the hive I grab 2 master healers. they take 50% of my gold each, so at that point, I am not earning any more gold, but it doesn't matter as I'm about to end the game