Thanks again Steve and MBDoc. Very insightful responses.
The car feels very stable, so that's fine. I guess there should be no uneven tire wear as well, since caster doesn't cause tire wear, from what you said earlier. On a 17 year old car, I can believe it if someone says that its not possible to bring it totally back to specs. However, I have never had any uneven tire wear, and wouldn't want that to start now.
The way I see it - if the car goes straight, steering wheel is not off-center, AND I don't see any uneven tire wear in the months to come, then the alignment has GOT to be fine.