if it's the bearing you could lift the front and wiggle the wheel. it would definately be noticable if it's so bad that it happens when you're driving. i have a little play in both bearings (280k miles +) but it's not noticable driving, so i think you would have a lot of play if the bearings are the culprit.
edit: and regarding what the general said, definately look at the axel too, it could act exactly as you described. with the car lifted, rotate the wheel and see if it's binding at any point.
let me know what you find, i'm interested.