If you have more than one Mauser that your loading for I would get the pacesetter dies. If you only have one rifle you can get either the collet dies or the pacesetter. You will need to use case lube with the pacesetter dies - it comes with the kit.
The collet die set doesn't crimp, but you don't need to anyway. Some folks crimp and some don't. The collet die only neck sizes so the brass you use must be from the gun you are reloading for. It is a 2 die set. The neck sizer and a bullet seater.
1) decap and neck size only die
2) bullet seating only die
The pacesetter dies full length size and have a factory crimp die. It is a 3 die set, but if you don't use the factory crimp you only use 2.
1) decap and full length size die
2) bullet seater and optional crimping die
3) factory crimp die it only crimps - you adjust the 2nd die to not crimp if you are using this.
Both sets come with a shell holder, dipper, and load data. The RGB dies are a full length sizing 2 die set without the shell holder, dipper, factory crimp die and data.
For the 9mm the 3 die carbide set is what you need.
1) decap and size die
2) expand the case mouth die
3) seat bullet and crimp die
They will come with some loading data and powder recommendations to use the included dipper.
I would also get a dial caliper, a manual and to trim the 8mm cases:
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=257748
