Jens,
You have choosen a 8x4 prop with a 2cell lipo.
This will not give the 470gr thrust, I guess max 250gr.
She will fly with 250gr thrust (almost 1 to 1 ratio), but not very sporty.
With this motor :
If you go for a 2cell lipo: 9inch prop (9x4.7 / 9x6 / 9x7 max)
If you go for a 3cell lipo: 8inch prop (8x4)
My advise would be to get both 2cell and 3cell with the 9inch and 9inch props and try what you find best.