The only triggers I have upgraded to are ALG for regular use and a Geissele SSA in my one precision AR. The SSA is a two stage that breaks at 2.5 and then 2 so I'm not sure if that's as light as you want but you can find them under $200 if you catch them on sale.
ALG all the way. They are made by the same company that does Geissele triggers. I think it's the wife who runs ALG IIRC.

