How much could this sell for?

[ConnorBazinga]

I built this pc with these specs http://www.xcase.co.uk/product-p/case-x-case-i9.htm
and wondered how much to sell it for, cost me around £450 to build and wasnt sure whether to sell for £500?

 

[ConnorBazinga]

I meant this
http://uk.pcpartpicker.com/p/E4T3