Ok so I'm getting ready to buy my first hand gun. I have been looking at lots of them and am in love with the xdms. I am leaning towards the 4.5 or 5.25. I'm am thinking 9 mm based on what I have learned from several people. I am stuck though. I don't know squat about sights and the 2 I looked at had very different sights. Are sights easily changed out? Would I be able to get a sight on the 5.25 with the glowing dots on the rear sight or am I stuck with the blank sight. Also is the longer barrel overkill for me. I am planning on primarily home defense and fun time at the range. I will cc after I get more comfortable with a gun but I'm guessing either is too big. I would love your thoughts on the matter if you have a chance.