I have a Geissele Hi Speed DMR in my 20" gun. It's way better than stock GI trigger for what I use that gun for. Stock GI in all my other guns. Works just fine.
Is nobody going to throw in a vote for the AR Gold?
I got to mess with Cyrwus's AR gold that he had in his rifle at the last 3 gun match and all I have to say is WOW!!
I have a Bill Springfield trigger and a CMC flat trigger and the AR Gold blew them both out of the water with ease.
It's not for the faint of heart though, that thing is super light and crisp. It felt like the 2 &1/4 lb trigger I have in my USPSA Limited gun.