Thanks for the responses guys,
The wheels are OEM, and I made sure to tighten everything right when I put the wheel back.
At first I thought the balance was the problem cause I had another car that the wheels were not balance correctly and it did a similar thing but that one did it at about 100 MPH. I think I'll take the car in for a re-balance and see if it fixes it.... I hope it's not a bent half shaft cause that would mean some real work...
Thanks again guys and keep your thoughts coming