LEDmarkers did mine, and it was around $600 depending on options and imagination. Mine looks relatively simple on the outside, but it is fairly custom on the inside: 40 LED array for turn signals, high power Luxeon LEDs for landing strip, parking light, and side marker, and paint job. The LEDs are driven with drivers and regulators suited for the job.
LEDMarkers 370Z Headlight Project [06/19/2009]