maybe the CV joints
Just to be sure, jack the car, put it on jack stands, remove the wheels and check out the brakes to be sure there isn't a problem. Also check the pads to be sure they are ok.
FYI, I used to have a viehicle that made a similar sound. I thought it was the wheel bearings, and when I repacked the bearings it would go away for about 6000-8000 miles. After 3 times repacking and one replacement of the bearings and outter races I discovered it was the grease seals. I just packed a bunch of grease behind the seal before installing it and the noise never happened again as long as I owned it.
