Lee delux rifle die set.

-shellholder
-collet neck sizer
-Full length sizer
-bulet seating die
+ other accessories.

I wouldn't bother worrying about a factory crimp die unless you are shooting an autoloader.

FL sizer is used the first time cases are reloaded. Its very useful if you get brass from someone else who uses a 25-06 but doesn't reload, this brass will need to be Full length resized before it will work properly in your rifle.

Collet neck sizer- use on brass fired in your rifle. It simply resizes the neck by using a collet to squeaze the brass around a mandrel. Using one of these dies can help in accuracy as the brass is fireformed to your chamber, it is also faster to reload with because you don't have to lube the brass to use it. Another advantage is that it greatly increases the potential life of your brass. If the brass starts getting tight in your chamber, revert back to the FL sizer on your next reloading.

Bullet seater- does what it is, it seats bullets in the case.

Powder dipper- I use these for trickling powder, I've never actually used one to measuer powder.

Shell holder- hooks on to the rim of the brass and holds it on the press's ram.

Lee reloading data- tends to be on the conservative side, which is a good place to start, but a few manuals like Speer, Hornady, or Lyman would be a better place for reloading data.