I just found out I'm getting a nice amount of money back from my taxes and have decided to buy some optics. I am looking to spend around 500 and I want to stick with a red dot. I have fixed sights on my AR so I would want it to work with them as well. I've been reading and I guess I would want it to be able to "co-witness" with the sights. Any suggestions on where to look or what to purchase?