The bearings in cusco arms are from NMB and are one of the highest quality aircraft bearings in the world. They are the default bearing for Airbus planes and are also used in some of the V8 super cars, among many other applications
Try tracking some of these things down (the only place I found that could help was a racing outfit at the silverstone race track who also supplied them to the 888 V8 racing team), the cost is horrific for a bearing.l
So going out and saying that something is better then that is a pretty big call, u sure as hell wont find anything better at any old bearing supplier (especially in oz).
As an example, my cusco caster rods have now done 51000 ks (a bit of track and a lot of road) from new and show no signs of wear what so ever