I build custom PCs as well, here's my current water-cooled rig:
Intel i7 4930k (overclock TBD)
Asus Rampage Extreme 4 Black Edition
Corsair Dominator DDR3-2133MHz RAM (8gb x4)
EVGA Titan X (x2) (overclock TBD)
EK waterblocks/backplates on GPUs (Acetal + Nickel)
EK Monoblock R4BE Edition
EK XTX 480mm rad (x2)
EX XTX 240mm rad (x1)
Corsair AX1200i PSU
Corsair 900D Chassis
Bitspower fittings paired with Primochill rigid revolver compression fittings
Bitspower 200mm clear res (x2)
Bitspower Mod Top/Kit for vertical stance
Swiftech MCP 655 pump (x2)
Intel 730 Series SSD 480Gb (x2 in RAID 0)
Samsung 840 Series EVO 120Gb (x2 in Raid 0)
12x Noctua NF-f12 120mm fans
Swiftech PWM splitter for all fans on rads
Noctua NF-P14s 140mm fan on rear case w/filter as an intake