I have the Centric Posi-quiet semi loaded calipers, the bendex ones. Centric puts a zinc like finish on the calipers which is good because my calipers still do no have any sort of surface rust on them and it has been a year. Just make sure you get the new calipers for a w126 and not a w123, because they are different. The stock brake
pads that come on loaded calipers suck for braking performance. They dust very little but I was going for more bite so I went with the yellow box textar brake pads. They dust a lot bite but have better bite cold and hot.

Also, I see on your parts list you don't have brake lines. You can use your existing ones but you should replace them if they are original and also because you are replacing everything else.