At the minute it's running an i5 2500k at 4.7Ghz and a GTX 295 although i've got a 580 coming for it.
It's a CM690 II Advanced, Gigabyte Z68X-UD5-B3 motherboard, 16Gb Corsair Vengeance Ram, a pair of intel 60Gb 330 SSD's in raid 0, 1Tb Seagate, AX 750 PSU, Gainward GTX295 shortly to be an EVGA 580.
Cooling consists of
2 x Laing DDC 1T+ 18 Watt
1 x Hardware Labs 30mm X-Flow radiator in the roof
1 x Phobya 60mm Radiator in the floor
XSPC Dual DDC Reservoir
Phobya UC1-LT CPU Waterblock
EK FC 295 GTX Single PCB Waterblock
4 x Scythe Gentle Typhoon Fans on radiators
1 x Silverstone Air Penetrator 120mm Red LED Fan front.
Lamptron FC 5 V2 Fan Controller
Cheers
Lee
you really have to use the motherboard RGB header for led. as far as i know the wires for RGB and fan control on a fan is two separate wires. so if you think you dont have enough fan header/RGB header, purchase a fan/led splitter