I just hit level 8 in Titan Quest and found that I can choose a secondary mastery. Warfare is my primary. I looked through the various options for a while and was a bit overwhelmed.

What secondary masteries (and skills) work in tandem with the Warfare abilities, and which don't work? For example, I saw one ability that looked like it would conflict with my "assign this to left click" ability, so I figure I should stay away from that sort of thing (unless... do they stack?). Are there any particularly effective/fun combos to look at?