I think you can get the discs cheaper. That kit uses 312 mm discs which are smaller than the Brembo Sports 340 mm I got for 75 £ from Amazon a couple of months ago. Right now they cost around 115 £, I think. You can also check oscaro.es/oscaro.fr, they make great prices for both discs and pads.
Not sure what pads that kit uses. Good enough R32 pads can cost around 100 £, but there might be cheaper available. Braided lines from HEL cost around 35 £ for those calipers.