price for Individual colours?

Hi there, i'm looking to buy a BMW 318i sedan soon, the only thing im still thinking about is the colour for the exterior... The default colours aren't really what i like, so i've been looking around for the Individual line colours. The colour i really dig is Chestnut Metallic, so what i'd like to know is the price for it...
Standard metallic colours are a 600 Euro (i'm in Belgium, Europe) option, im guessing the individual colours will be more expensive, i just wanna know how much more expensive :)
thanks alot for any advice u can give me

sense