Rack and pinion

A rack & pinion is better than a recirculating ball. Make sure you have no bump steer if you get a rack and mount it yourself.
The problem we have encountered is in fact getting the rack high enough to minimise the bump steer. You may have to jack the engine or massage the sump. The factory setup is not free of bump steer by the way.
The rack we use is from our Holden Commodore range of cars. Our local GM product. Not sure if you have a local car with a narrow enough track.