Methinks you are overpaying, and getting unnecessary work.

Your control arms and ball joints are not bad (assuming your miles are correct). If you replace your tie-rod ends and adjust the front wheel bearing play, your car will be as tight as a Tennessee virgin for another 100K. You've got at least 50K before worrying about ball joints. Remember that your car is essentially a heavy-duty taxi.

The belt is a DIY. What's wrong with the tensioner?

Also, I second the recommendation of trying the other shop.

__________________
Prost!