Running toe-out on the front of the car will do wonders for the accuracy of the steering and the straight-line running. I'm currently at 1mm spacing on the steering links.

I still run the Tamiya plastic parts in the steering apart from the posts that the bearings run on - I have changed those for Tamiya's optional alloy ones. I'm not that happy about the fit between the cranks and the rack using the step screws, but my car runs well enough and I have yet to bend any of those parts.