Those are the most expensive pieces of pro I have ever seen.
OP: Nuts are great, use them wherever possible and save the cams for when they are necessary or you are pumped. I have found C4 cams to be best in the mid to large sizes and Mastercams to be best in the small sizes, but everybody has their own opinions. My #8 Stopper, however, is by far my most used piece.
-Mark