For the bar puller, I really like the kind that come with the cut off tool.
Those are very pricey though. My QCTP only has 5/8" tool holders. I didn't see any that would accommodate one that small. So, leaning toward one that would operate from the gang tool setup with Z. No sure yet what all I will have to do to the head, so I will wait on that decision.
I may even decide to machine my own.
One other thing worth mentioning. All of my parts are brass or plastic. Delrin. It won't take much force to grip either well. I only use 3 different sizes of rod. 3/8", 9/16" and 3/4". That means not a lot of money spent on collets.