Sorry, I would have said non-auto-x/track use, but I assumed that people who track thier Contours probably have a firm enough grip on suspension tuning to know what works for them. I mean non-racing, and I said "bang for the buck", not "best". Obviously, if you race, and feel the need for that much roll resistance in the rear (some don't), then the Aussie is better. Is it worth 80-90% more, like it may end up costing if that GB ever goes through? Not for street use, IMHO. A 17% difference in roll stiffness, and ~3lbs extra weight isn't going to be noticeable on anything but the most finely-tuned car with the best driver. Honestly, I highly doubt if I swapped bars on you, you'd even notice. I wouldn't have bought an Aussie if I didn't get one used.
Again: The Aussie is a great bar, but you will never tell the difference on the street. Plus, you can actually get this bar...
