Werm,

Do what Brian said, to buy yourself some time (read: wearing out the tires completely). I would think once the front end components are changed, then new tires, then 4 wheel alignment (er....immediately after new tires).

Doesn't have to be an MB dealer, but a reputable shop that knows what they are doing. From my experience, the new alignment systems are pretty automated, but none the less, it's only as good as the person doing the work.

Just my .02