I remember my first AR buy...man was I confused!!!
The modularity of the AR is great.
The modularity makes buying your first one a nightmare.
I finally plunged in and bought a Daniel Defense M4V1.
If I had to do it over, I would have gone with a completely flat top AR, with collapsible iron sights, front and rear, but other than that, I've been very happy with it and have added all sorts of bells and whistles.
It's like a lego set for big boys. And a lot more dangerous.