To the original poster, go down the list I made from cheapest fix to the most expensive.
Spend $50 on alignment and $20 on tire balance or whatever it costs.
If the problem is still there move on to the next thing...
When you are getting your wheels balanced ask the mechanic to visually check the rotors, it's easy to see if the rotors are warped..
Yeah warped rotor will cause vibration.
if you have warped rotor don't even think about trying to fix the rotor
Just get new ones. Autozone is around $80 for a pair i think.
When rotor is warped it hits the brake and causes the vibration when driving.
Also when braking you can feel it too.
I drove around with a warped rotor for like a year, i got use to it.
Now that I have all new rotors and everything it feels soooooooooooo nice