I tend to think it is a ball joint or some other suspension component. If it was power steering related, I would imagine that with the car sitting still and the wheel fully cranked, it would still make this noise.
1999 Eclipse GS Built motor Hahn 16G Turbo w/ FMIC Hahn Stage 5 Portfueler (270's & 500's) Zeitronix Zt-2 wideband w/ 3.5bar MAP 3" SS Turbo Back CM Stage 4 Clutch and Fidanza Flywheel Baer Big Brake Kit