If this is for a "duty grade" rifle.
Don't skimp on optics.
Aimpoint or Eotech.
The advantage of the red dot type optics are they allow for shooting from nonconventional positions with unlimited eye relief/miniscule parallax.
I think you can get an Aimpoint PRO (Patrol Rifle Optic) for around $500 or less if you shop around.
If this is for self defense, you don't "need" magnification, IMHO.
I have owned/used ACOG, Trijicon TR24 1X4 and Aimpoint with a 3x magnifier.
I only use a plain Aimpoint now.