That a nice stick and looks like you got a lot of high quality parts on there.
I would say the "upgrade" to an over-priced Giselle trigger would be a waste of good ammo or magazine money honestly. Even a good and common AR shooter is going to see, maybe, a 5-10% overall difference over the RRA 2-stage.
I believe my RRA triggers are just as good as any I have shot on any of the AR's I have tried, but I am not a double distinguished, 3 gun competitor either.
$250-$300 for a trigger is a lot of money when you already have a really good one in RRA.