Okay... I think I'll go with the custom solution... somehow I feel better that way. This would be the final version. I changed/added a few things (ATX mainboard, tower, fans). What do you think?
1x Corsair H100i v2 (5.50cm)
1x ASUS GeForce GTX 1080 STRIX A8G-GAMING (8GB, High End)
1x Intel Core i7 7700K BOX (LGA 1151, 4.20GHz, Unlocked)
1x Samsung 960 EVO (500GB, M.2 2280)
1x Corsair Vengeance LPX (2x, 8GB, DDR4-3200, DIMM 288)
1x Cooler Master V Serie V650 (650W)
1x ASUS STRIX Z270E GAMING (LGA 1151, Intel Z270, ATX)
1x Phanteks Enthoo Evolv ATX (Midi Tower)
3x Noctua NF-P14s redux 1500 PWM (140mm) (for case)
2x Noctua NF-S12B redux 1200 PWM (120mm) (for Corsair H100i v2)
Have I forgotten anything?