I've been thinking for a little while now that my next gun will be the Berreta CX4 Storm carbine in 9MM. The one gun test I've read on it so far, the author said he used a Leupold red dot of some kind. Now, knowing that anything Leupold will be out of my price range, what are some options for another type of red dot or holo-style sight?

Do they all work pretty much the same way your normal old fashioned scopes do? The site shows it having a Burris Speed Dot on it, is this a good way to go? Let me know, I value you guys' opinions.