My Glock 21 Gen 4 gets out of jail on Tuesday, it already has a ghost trigger and trijicon night sights, I cant make up my mind about a holster, I am down to a Sherpa or similar (I think), what other upgrade might I want to consider?? Im not much of a pistol guy, had/have a few, mostly S&W wheel guns, the only autos I have had was a Ruger MKII Target and a Ruger P90 (shot like crap, horrid trigger), so any edumacation would help.