What sigils do people like to use on their weapons? 
In normal play, I tend to use my knight draconic armor (power/precision/toughness) or my magic find gear (power/precision/magic find), and as such, tend to switch between these…
Greatsword (Superior Sigil of Luck) – I use this to build up luck to 25, and will then sometimes switch to another weapon. I plan to make a second greatsword sometime soon with a different Sigil to switch to.
Longbow (Superior Sigil of Fire) – Nice thematic effect with fire arrows already. Thinking of putting a similar sigil into my rifle too.
Still working on what to put into other weapons such as my weapons sword and axe, my dungeon mace (which is equipped with power/vitality/tough armor), and my shield (same as mace), haha.