I believe if you are looking into a reasonably priced red dot, the Mueller is the way to go. Lots of guys top thier rigs with them, and have had good luck with them, and you have the option of 4 reticles to choose from.
Now if you have an extra 150.00 to spend, I would go with the Burris FFIII. An outstanding sight, and probably the best bang for your buck in this price range.
Those would be my choices if I were looking for a red dot. I don't believe you can go wrong either way, and it's really gonna come down to how much you want to spend.