Ok , got this together :
http://www.caseking.de/shop/catalog/Mainboards/All-Mainboards/ASUS-X99-DELUXE-Intel-X99-Mainboard-Sockel-2011-V3::28763.html?from=cart
http://www.caseking.de/shop/catalog/Processors/Socket-2011-V3-Intel/Intel-Core-i7-5930K-35-GHz-Haswell-E-Sockel-2011-V3-boxed::28757.html
http://www.caseking.de/shop/catalog/Memory/All-Memory/Avexir-Platinum-Series-DDR4-2400-CL16-16-GB-Kit::28734.html?from=cart two times
Ok , so for a budjet of 6K euros including transport of 100€ to wherever you are , I would get :
CPU : Intel Core i7-5930K REASONING : 8 cores :D
Motherboard : MSI X99S SLI Plus REASONING : Better ones might come later
RAM : Avexir Platinum Series, DDR4-2400, CL16 - 16 GB Kit REASONING : buy two . black.
GPU : I know you hate CF/SLI , but a single card is sort of weak for your budget.
R9 290x Reasoning : 3 of em' , better than anything .4GB of vram for 4K.
PSU : Corsair AX1500i Reasoning : I think it's a bit expensive , but it's the best money can get.
Storage : 850 pro samsung 1TB Reasoning : 1tb is enough , blazing fast , if you need more maybe get a hard drive .
Case and cooling :
Case : Corsair 900D Reasoning : Spaaaaace , you can fit a house in there :p , and good for WC .
Fans : Noctua industial 120mm nf-f12's Reasoning : Noctua , and I'l inclue a way to power them all off of the psu.
Get 14 of these baby's ( or less , depending on the WC and your likes , but this fits the all black theme very well ) .
Watercooling :
GPU blocks : XSPC Razor R9 290X Reasoning : The only all black ones I see .
Rads : 480mm ( botom + top ) twice , 360mm ( front ) Reasoning : you don't need more cooling than that ;D
Pump : Alphacool VPP655 good pump , same as the D5 , there is no better .
CPU block Swiftech Apogee XL Nice and black
Res : Phobya Balancer 250 Not the best , I'l find another one later .
395,94 €
I'm not so good with WC , so if someone can give some input , that would be great :D
I'l match the metals later