Whats your opinion?

*With Option #2 also add 4-wheel Alignment

First some questions

Tune-Up - Has one ever been done?
Tie Rods w/ 4-Wheel Balance and Rotation - Are they bad?
Steering Wheel Position Sensor - whats wrong with it?
Wheel Hub Assembly - Is it going bad?

In my opinion, I'd take care of the tie-rods, and hub assembly, then the SPS, then the tune-up. Your going to have to realign the car with the tie-rods, and the SPS being replaced, so your best bet would be to do them at the same time, along with the hub assembly.

ALL need to be replaced and/or have never been replaced.

My vote is Tie Rods, b/c if they are out of whack they can negatively impact many other parts, including making your tyres wear unevenly.

Is the wheel hub making a humming noise?

Yes it does, and it changes when you turn the wheel at speed.

definitely alignment and tie rods. they can mess up expensive tires if not correctly adjusted.

nothing else can really do immidate damage.

I would change the wheel hub first.

Tough choices in that poll. I'd get the car to stand up straight as priority one. Do the hub assembly & tie rods. The steering wheel pos. sensor & tune up can wait a while.