Hi!
The Graupner Cam prop (Black variant) is rather expensive. The RAM 10x6 is equall to the Graupner 10x6 so I would try that one instead.
RAM are British made props.
But...The APC line of props are prefered in most cases when it come to delivering good performance. So you have to check your self.
The only props you should avoid are the white tipped Master A props. They are loud and give poor performance. The MA "scimitar" line of props are rather good though.

How do you think 5% nitro performs compared to 15% nitro that seems to be the norm in the US??