The Chip McCormick drop ins are really good. Match grade parts and little or no fitting for as price that you can easily afford. Any parts from Fusion are great too.
in my Springer the hammer and grip safety are chips. I can't remember where I got the barrel bushing. As to sights it depends what you are wanting ot do. Just remember if you get any type of night sights or anything with a novac sight look you will have ot have the slide ground down to fit it. Same with a Mil- Spec. I chose to just use a better front site and left the rear alone on my mil-spec. I didn't want to cut it and change the original design. I have others that are set up for the other sights anyway