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If between 60-80 some type of harmonic is being setup, the suspension is out of tune sort to speak. Often very tough to diagonose.
Are you sure it is the front end, if a vibration felt under the set can also be the rear.
Tires and rims would be the number one suspect. Bent or out of round rim, tire ply starting to separate. Have you tried switching the tires front to back, rotating in the spare? Perhaps a friend as a set that will fit your car.
Have you gone over the suspension in detail, bushings, ball joints, tie rods ends (both ends of rod), steering system for excess play, wheel bearings, bent hub (check these with a dial indicator). Sometimes even variations in lug nut torque can cause issues.
Is the vibration still there if you take the car out of gear or place it in neutral?
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