I bought a Trueglo Holo sight for $100, It would have been nice if the dot didnt shift on the screen when switching between reticles. I went to the store to buy an EOTech yesterday, but ended up buying a Burris 3x32 tactial scope. The burris has built in drop compensation for the 5.56 round, big plus for me!
http://www.burrisoptics.com/ar332.html