Alright, I have two options for the "adventurers" that will come after you:
1. Play them seriously, with well thought out, cunning plans and a total lack of mercy, or
2. Play them like massive caricatures, while still maintaining full competence.
Your pick. One gives a difficult challenge, and one gives you crazies. I really am leaning towards the second, but if you guys want the adventurers to be more serious about "The Job"...