A holosun 510c is $420 brand new. It's led technology which looks crisper than holographic sights like on the eotech. I switched from an eotech to a holosun and couldn't be happier
I was more specifically looking at a Vortex SPARC AR Red Dot 299$. Any good?
http://www.bullseyelondon.com/vorte...dot-with-multi-height-mount-system-matte.html
No love for the Vortex Strike Eagle 1-6? At $419 it would be my go to.