Front end shaking wildly

[Sir. Nate]

Okay, periodically my car's front end shakes, and the steering wheel moves back and forth. It seems to happen more at around 60mph, but never under 40mph. About a week ago one of the power steering hoses came off the hard line spilling fluid all over the exhaust. I fixed that and re-filled the tank, worked out all the bubbles ect. and the steering works fine now, but could this have caused a problem with the steering rack? I thought it might be my warped rotors, so I had them turned and replaced the pads, but it didn't seem to help the problem. I haven't ruled out an un-balanced tire, but I don't think that could cause this bad of a vibration. I also checked my front tire pressure and they're within 1 psi of each other. This has me totally stumped.