AR optics

[iron man]

Bought a AR-15 while I was home on leave early July. Came flat top with M16 style front post sight. Added a flip up rear sight from magpul as a temporary item so that I could shoot it. Also my future father In law added magpul MOE hand guards to it for me with rail sections. Now I'm looking for some sort of scope/red dot sight to add up top. It's looking a little bare. It's a rifle carbine with the mid length gas system and a full stock

Want to be able to tell a scope is on top.

A few choices are aimpoint, compM4 (M68 in the military, upgraded CompM2), compM2.
Or even the acog type scope we top our M16A4s and M4s with if I had the money.

Looking for something that I can reach out and tag a target at 300 yards and maybe even beyond but not spend a arm and a leg on.