...and remember, the AR15 is called "the Barbie dream house for guys" for good reason.
Whatever you spend on the rifle, budget at least that much per year for accessories...
Personally, I don't go for the "hang 4 lbs of crap you'll never use" on your AR train of thought but 1 upgrade I would recommend 100% is to replace the trigger group with a drop in single stage unit.
I've got over 10k rounds through my Chip McCormic trigger. It breaks like a glass rod at 3 lbs and just keeps on ticking!
Congrats ZG, I'm sure you'll enjoy it