Hiya jimzilla and thanks for your thread. Its a really nice gun, and at 1700 price point ,its pretty modded up from the factory. I would think you want to break it in and then decide on investing more. I do admit to replacing the plastic trigger with a metal one,and for my use preferred the old style rear blade,as it served nicely as a slide racker. I did use the DPM,but noticed no difference in recoil reduction, simple SS which is prolly what it came with is fine. Its factory mag release I thought is fine too,so use it a bit before ya decide. The trigger guard is an improved design to also help you get a better grip,I'd leave that one be too. I don't use a holster for my range gun,so get little use out of the safety,but if you do and are a competition shooter it might could be an advantage. The gun has already has a competition hammer,and imagine springs and trigger action is great out of the box. And cz used S&B ammo at the factory,so you are set. The DPM comes with additional springs if ya needed,with instructions.
You might experiment with a green FO rod and compare it to the red one,some folks see it better,especially outdoor shooting. Extra mags or the extended 26rd mags are nice,but at 130 a mag ,half a dozen cost round 800bucks. Hope to see your day at the range pics soon.Be well.