The V8 Supercar Series in my opinion is the second most competitive series on the road side. A Class Grand Prix is the most, V8 second. DWC and Pro obviously are ahead of those 2. The problem is with that though, almost everyone practices all week long for 1 main broadcasted SOF race (Tonight 9:45pm AEDT GMT +11). So therefore, barely and races go official. There are few smaller "America's" races and smaller Aussie SOF races on our sunday nights but really, less than 10 would go official weekly.
The ANZ Motorsport setups are a good starting point for newcomers, but are tuned with very little time and effort. They also don't have a lot of front end point so they're not fast. I can almost gurantee that's not what their top drivers are using in that team, but sure, it is a good starting point for newcomers.