I picked up a Glock 19 for a song, but I need to replace the rear sights. I need some input as to what kind of sights to use. I am considering the options of night sights, or fiber optic sights. Some have told me that they are easy to replace, but I want it done right. Any ideas or suggestions will help me out. I've looked at Midway, and Cheaper Than Dirt. So now I am open to your expertise on this subject. Thanks for taking the time.