Well the 49.50 pump kit has a guide for the pump rod to help keep it from twisting but it will generate more friction.
The $77 kit has the extra guide rod which IMHO is the best method for preventing the handle from twising. The pump handle will be delrin but the plate on the back of it is aluminum
The ANS kit is just the most basic of pump kits. I ran one like it for a couple of years and really never had any complaints. The barrel will keep it from twising too much and all I had to do to cock it was smack the front of the pump anyway and the spring did the rest so I never really noticed any twisting.
If you're not willing to get the $77 CCM kit then I would go with the ANS kit.