Just some comments in addition to what Chris and Pete have said:
High-pitched brake squeal I'm guessing? Happens sometimes even with new pads and disks, as was the case with my car. I took it back to the garage, they took it apart, cleaned it and regreased it, and it has disappeared since.
I guess you mean the steering is "tramlining" over uneven surface? I found this to be more pronounced with the default Lexus geometry setup for the IS200. After changing it over to WIM's geometry settings, it has lessened somewhat. You will definitely notice this especially after coming from an Audi, seeing that most Audis have very little (or even negative) "scrub radius" in their front suspension design.
Do a search on this forum for "Wheels in Motion" or "WIM", and I would suggest having your geometry looked at by them.
Of course, if I have guessed your problems wrongly, please ignore! :)